Topic
Rocks
3 questions tagged Rocks — spanning every one of the seven Ws.
whose
Whose work first described the rock cycle?
James Hutton introduced the rock cycle concept in the late 18th century. He showed how rocks can be created, altered, buried, and uplifted again.
Earth ScienceRocks
what
What is peridotite?
Peridotite is a dense, dark ultramafic rock made mostly of olivine and pyroxene, and it makes up much of Earth’s upper mantle.
Earth ScienceRocks
why
Why do some volcanic eruptions produce pumice that can float?
Pumice forms when gas-rich lava cools so quickly that it traps bubbles inside. Those air-filled pores can make the rock less dense than water.
VolcanoesRocks