Vocab
What is a root?
when a plate goes down deep into the liquid mantle layer beneath it
What is a hotspot?
a very hot region of magma
Is oceanic crust older or younger than continental crust?
younger
What are the 2 types of tectonic plates?
oceanic and continental
What type of boundary makes earthquakes?
transform
What is erosion?
breakdown/weathering of rock
What is an island arc?
a bunch of volcanoes lining a subduction boundary
Does oceanic crust sit higher or lower in the mantle?
lower
2 continental plates converging makes what?
mountains
What does a seismograph measure
earthquake waves
What is topography?
elevation of Earth's surface
What is orogeny
mountain-making
Is oceanic crust more or less dense than continental crust?
more dense
What is caused oceanic plates to sit lower in the mantle than continental plates?
higher density
What is pancaking
when the walls fall in and the ceilings collapse onto the floors
What is isostasy?
Something (tectonic plate) balancing or floating on the surface of the liquid
Does oceanic crust have larger or smaller rocks?
smaller
What types of rocks are found at the top of mountains?
oceanic sedimentary
I am thick and explosive magma, what am I called?
rhyolitic
What is isostatic rebound?
when the top part of the mountain is eroded, so the rest of the crust rises up higher
What is an underwater mountain made by a hotspot called?
seamount
a continental plate and oceanic plate converging makes what?
trench and volcanoes through subduction
Which scale measures the destructiveness of an earthquake?
Mercalli scale