Tag Archives: weathering

Book Review: Joshua Tree National Park Geology

I picked up a copy of Joshua tree National Park Geology while on a family adventure in Joshua Tree National Park. I found my copy at one of the park entry bookstores, but you can also order it online. If … Continue reading

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Weathering of Igneous Rocks

What physical processes contribute to the weathering of rock and why might you expect mafic igneous rocks to weather at a faster rate than felsic igneous rocks? Weathering is the physical disintegration and chemical decomposition of rocks into soil, loose … Continue reading

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Rangitoto Island, New Zealand

Rangitoto, New Zealand is the youngest and largest volcano in the Auckland Volcanic Field. With a final eruption at least 600 years ago, the volcanic island is slowly weathering into soil. The rate of weathering is increased both by rainfall-watered … Continue reading

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Dual-Scale Weathering

The landscape of rounded boulders at Joshua Tree Park, California, are the legacy of weathered bedrock. As overlaying material is eroded away, the release in pressure leads to exfoliation — shedding the crust of weathered rock. On a much shorter … Continue reading

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Basalt Cobbles & Onion Skin Weathering

At Settlement Point east of Melbourne, extensive basalts and tuffs of the Older Volcanics form the cliffs and shore platforms. The spherical weathering occurs as water penetrates along joints and fractures, decaying the rock layer by layer like onion skin. … Continue reading

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Squeaky Sand on the Friendly Beach

The white sands of Friendly Beach, Tasmania, Tasmania, squeak under every step. The sand is nearly pure silica, originating in quartz-baring rocks, eroded into sand, compacted into sandstone, and re-eroded into fine, smooth, rounded grains. The black rock shore platforms … Continue reading

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