magma
Rhyolitic magma is silica-rich and viscous. This topic is part of Geology within Science & Nature. This page currently draws on 32 supporting questions, with answers and bonus facts available below.
magma trivia questions
Magma that cools slowly underground tends to form what?
Answer: Large crystals
Bonus fact: Slow cooling gives mineral crystals time to grow.
Which magma type generally has the highest silica content?
Answer: Rhyolitic
Bonus fact: Rhyolitic magma is silica-rich and viscous.
A volcano is an opening through which magma, gas, and what can erupt?
Answer: Ash
Bonus fact: Volcanoes release molten rock and fragmented material.
A magma chamber stores molten rock where?
Answer: Below a volcano
Bonus fact: Magma chambers are underground reservoirs.
What can happen if pressure builds greatly in a magma chamber?
Answer: Volcanic eruption
Bonus fact: Gas and magma pressure can fracture surrounding rock.
If much magma leaves a shallow chamber, the ground above may collapse to form what?
Answer: Caldera
Bonus fact: Large calderas often form after major eruptions.
Is most of Earth's mantle liquid magma?
Answer: No
Bonus fact: Most mantle rock is solid but can flow slowly over geologic time.
A magma plume rises from deep within what?
Answer: Earth
Bonus fact: Hot buoyant material can rise through the mantle.
What must happen for rock to become magma?
Answer: Melting
Bonus fact: Cooling magma later forms igneous rock.
How does many large calderas form?
Answer: The ground collapses after a magma chamber empties
Bonus fact: Withdrawal of magma can remove support and trigger collapse.
Basaltic lava is rich in iron and what other element?
Answer: Magnesium
Bonus fact: Basaltic magma is mafic, rich in magnesium and iron.
What process at mid-ocean ridges creates new oceanic crust?
Answer: Seafloor spreading
Bonus fact: Magma rises and solidifies at divergent boundaries.