volcanoes Flashcards
1
Q
name two pyroclastic materials that are ejected from a volcano during an eruption
A
ash
lava
2
Q
what is the name for a volcanic cone that has collapsed in on itself after an eruption
A
caldera
3
Q
explain briefly what is meant by the process of subduction
A
heavier oceanic crust collides with and slides beneath the lighter continental crust, as it slides into the mantle it melts and is recycled
4
Q
explain briefly what is meant by a dormant volcanoe
A
volcano has not erupted in hundreds of years
5
Q
explain why some volcanoes erupted violently
A
if a lot of gas is trapped within magma, pressure will build and build until eventually the magma erupts explosively out of the volcano
