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When this pressure is released, for example as a result of plate movement, magma shoots to the surface causing a volcanic eruption. Above the ground the liquid rock is called lava and as it cools ...

Some of the volcanic rocks are up to 6 million years old, while others were left by eruptions that happened as recently as a few thousand years ago, according to the Global Volcanism Program at ...

After lying hidden beneath metres of volcanic rock and ash for 2,000 years, a "once-in-a-century" find has been unearthed in the ancient Roman city of Pompeii in Italy. Archaeologists have ...

It deposited a cottage-size mound of grayish-blue sand—190 metric tons of a crushed volcanic rock called basalt. Farmers spread the pulverized basalt across several fields that they sowed with ...

Iceland has seen some major volcanic activity in the last couple of years. Travel expert Rick Steves has some advice for ...

covering roughly three million square miles in volcanic rock and causing sharp climate swings between hot and cold. “With such rapid release of carbon dioxide, sulfur dioxide, soot and other ...

Visitors may encounter unstable ground, sharp volcanic rocks, and hidden lava tubes that pose risks of injury. The park’s volcanic activity can produce hazardous gases like sulfur dioxide ...

Throughout Earth's history, ice caps have been very rare, but a model of the past 420 million years suggests an explanation ...

Additionally, the porous volcanic rock plays a critical role in recharging aquifers that supply water to Northern California. Aerial view west across the upper part of Medicine Lake Volcano.

Fertile soils frequently blanket their slopes thanks to the slow breakdown of ancient volcanic rocks, which releases a host of nutrients vital for healthy crops and vineyards that produce ...