Lava in Hawai’i is reaching the ocean, creating new land but also corrosive acid mist


Dave McGarvie, The Open University and Ian Skilling, The University of South Wales

There is something special and awe-inspiring about watching new land form. This is what is now happening in Hawai’i as its Kīlauea volcano erupts. Lava is reaching the ocean and building land while producing spectacular plumes of steam. These eruptions are hugely important for the creation of new land. But they are also dangerous. Where the lava meets the ocean, corrosive acid mist is produced and glass particles are shattered and flung into the air. Volcanic explosions can also hurl lava blocks hundreds of metres and produce waves of scalding hot water.

At Kīlauea, lava is erupting from a line of vents on the volcano’s flanks, and is moving downslope to the edge of the island, where it enters the ocean. This is a process that has been witnessed many times at Hawai’i and other volcanic islands. And it is through many thousands of such eruptions that volcanic islands like Hawai’i form.

The new lava being added to Hawai’i by this latest Kīlauea eruption replaces older land that is being lost by erosion, and so prolongs the island’s lifespan. In contrast, older islands to the north-west have no active volcanoes, so they are being eroded by the ocean and will eventually disappear beneath the waves. The opposite is happening to the south-east of Hawai’i, where an underwater volcano (Lōʻihi Seamount) is building the foundations of what will eventually become the next volcanic island in this area.

How lava gets to the ocean at Hawai’i

The lava erupting from the current Kīlauea vents has a temperature of roughly 1150 degrees °C, and has a journey of between 4.5km and 5.5km to reach the ocean. As this lava moves swiftly in channels, it loses little heat and so it can enter the ocean at a temperature of over 1000 degrees°C.

When lava meets the sea, new land is formed.
EPA

What happens when lava meets the ocean?

We are witnessing one of the most spectacular sights in nature – billowing white plumes of steam (technically water droplets) as hot lava boils seawater. Although these billowing steam clouds appear harmless, they are dangerous because they contain small glass shards (fragmented lava) and acid mist (from seawater). This acid mist known as “laze” (lava haze) can be hot and corrosive. If anyone goes to near it, they can experience breathing difficulties and irritation of their eyes and skin.

Apart from the laze, the entry of lava into the ocean is usually a gentle process, and when steam is free to expand and move away, there are no violent steam-driven explosions.

But a hidden danger lurks beneath the ocean. The lava entering the sea breaks up into blobs (known as pillows), angular blocks, and smaller fragments of glass that form a steep slope beneath the water. This is called a lava delta.

A newly formed lava delta is an unstable beast, and it can collapse without warning. This can trap water within the hot rock, leading to violent steam-driven explosions that can hurl metre-sized blocks up to 250 metres. Explosions occur because when the water turns to steam it suddenly expands to around 1,700 times its original volume. Waves of scalding water can also injure people who are too close. People have died and been seriously injured during lava delta collapses

So, the ocean entry points where lava and seawater meet are doubly dangerous, and anyone in the area should pay careful attention to official advice on staying away from them.

Pillow Lavas form underneath the ocean.
National Oceanic & Atmospheric Adminstration (NOAA)

What more can we learn from these eruptions?

Once lava deltas have cooled and become stable they represent new land. Studies have revealed that lava deltas have distinctive features, and this has enabled volcanologists to recognise lava deltas in older rocks.

Remarkable examples of lava deltas have been discovered near the top of extinct volcanoes (called tuyas) in Iceland and Antarctica. These deltas can only form in water and the only plausible source of this water in this case is melted ice. This means that these volcanoes had melted water-filled holes up to 1.5km deep in ice sheets, which is an astonishing feat. In fact, these lava deltas are the only remaining evidence of long-vanished ice sheets.

The ConversationIt is a privilege to see these incredible scenes of lava meeting the ocean. The ongoing eruptions form part of the natural process that enables beautiful volcano islands like Hawai’i to exist. But the creation of new land here can also bring danger to those who get too close, whether it be collapsing lava deltas or acid mist.

Dave McGarvie, School of Physical Sciences, The Open University and Ian Skilling, Senior Lecturer (Volcanology), The University of South Wales

This article was originally published on The Conversation. Read the original article.

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Spending time alone in nature is good for your mental and emotional health



File 20180529 80633 loc9im.jpeg?ixlib=rb 1.1
Hiking the Savage River Loop in Denali National Park and Preserve, Alaska.
Lian Law/NPS

Brad Daniel, Montreat College; Andrew Bobilya, Western Carolina University, and Ken Kalisch, Montreat College

Today Americans live in a world that thrives on being busy, productive and overscheduled. Further, they have developed the technological means to be constantly connected to others and to vast options for information and entertainment through social media. For many, smartphones demand their attention day and night with constant notifications.

As a result, naturally occurring periods of solitude and silence that were once commonplace have been squeezed out of their lives. Music, reality TV shows, YouTube, video games, tweeting and texting are displacing quiet and solitary spaces. Silence and solitude are increasingly viewed as “dead” or “unproductive” time, and being alone makes many Americans uncomfortable and anxious.

But while some equate solitude with loneliness, there is a big difference between being lonely and being alone. The latter is essential for mental health and effective leadership.

We study and teach outdoor education and related fields at several colleges and organizations in North Carolina, through and with other scholars at 2nd Nature TREC, LLC, a training, research, education and consulting firm. We became interested in the broader implications of alone time after studying intentionally designed solitude experiences during wilderness programs, such as those run by Outward Bound. Our findings reveal that time alone in nature is beneficial for many participants in a variety of ways, and is something they wish they had more of in their daily life.

On an average day in 2015, individuals aged 15 and over spent more than half of their leisure time watching TV.
Bureau of Labor Statistics, Americans Time Use Survey

Reflection and challenge

We have conducted research for almost two decades on Outward Bound and undergraduate wilderness programs at Montreat College in North Carolina and Wheaton College in Illinois. For each program, we studied participants’ experiences using multiple methods, including written surveys, focus group interviews, one-on-one interviews and field notes. In some cases, we asked subjects years later to look back and reflect on how the programs had affected them. Among other questions, our research looked at participant perceptions of the value of solo time outdoors.

Our studies showed that people who took part in these programs benefited both from the outdoor settings and from the experience of being alone. These findings build on previous research that has clearly demonstrated the value of spending time in nature.

Scholars in fields including wilderness therapy and environmental psychology have shown that time outdoors benefits our lives in many ways. It has a therapeutic effect, relieves stress and restores attention. Alone time in nature can have a calming effect on the mind because it occurs in beautiful, natural and inspirational settings.

Spending time in city parks like Audubon Park in New Orleans provides some of the same benefits as time in wilderness areas, including reduced stress levels and increased energy levels.
InSapphoWeTrust, CC BY-SA

Nature also provides challenges that spur individuals to creative problem-solving and increased self-confidence. For example, some find that being alone in the outdoors, particularly at night, is a challenging situation. Mental, physical and emotional challenges in moderation encourage personal growth that is manifested in an increased comfort with one’s self in the absence of others.

Being alone also can have great value. It can allow issues to surface that people spend energy holding at bay, and offer an opportunity to clarify thoughts, hopes, dreams and desires. It provides time and space for people to step back, evaluate their lives and learn from their experiences. Spending time this way prepares them to re-engage with their community relationships and full work schedules.

Putting it together: The outdoor solo

Participants in programmed wilderness expeditions often experience a component known as “Solo,” a time of intentional solitude lasting approximately 24-72 hours. Extensive research has been conducted on solitude in the outdoors because many wilderness education programs have embraced the educational value of solitude and silence.

Solo often emerges as one of the most significant parts of wilderness programs, for a variety of reasons. Alone time creates a contrasting experience to normal living that enriches people mentally, physically and emotionally. As they examine themselves in relation to nature, others, and in some cases, God, people become more attuned to the important matters in their lives and in the world of which they are part.

Solo, an integral part of Outward Bound wilderness trips, can last from a few hours to 72 hours. The experience is designed to give participants an opportunity to reflect on their own thoughts and critically analyze their actions and decisions.

Solitary reflection enhances recognition and appreciation of key personal relationships, encourages reorganization of life priorities, and increases appreciation for alone time, silence, and reflection. People learn lessons they want to transfer to their daily living, because they have had the opportunity to clarify, evaluate and redirect themselves by setting goals for the future.

For some participants, time alone outdoors provides opportunity to consider the spiritual and/or religious dimension of life. Reflective time, especially in nature, often enhances spiritual awareness and makes people feel closer to God. Further, it encourages their increased faith and trust in God. This often occurs through providing ample opportunities for prayer, meditation, fasting, Scripture-reading, journaling and reflection time.

Retreating to lead

As Thomas Carlyle has written, “In (solitary) silence, great things fashion themselves together.” Whether these escapes are called alone time, solitude or Solo, it seems clear that humans experience many benefits when they retreat from the “rat race” to a place apart and gather their thoughts in quietness.

The ConversationIn order to live and lead effectively, it is important to be intentional about taking the time for solitary reflection. Otherwise, gaps in schedules will always fill up, and even people with the best intentions may never fully realize the life-giving value of being alone.

Brad Daniel, Professor of Outdoor Education, Montreat College; Andrew Bobilya, Associate Professor and Program Director of Parks and Recreation Management, Western Carolina University, and Ken Kalisch, Associate Professor of Outdoor Education, Montreat College

This article was originally published on The Conversation. Read the original article.