Volcanoes
What is a shield volcano?
a volcano with a wide base and gentle slopes
What is a scientist who studies volcanoes called?
volcanologist
0-2mm
What does VEI stand for?
Volcanic Explosivity Index
What is continental drift?
Tectonic plates moving and pulling continents apart
What is a composite volcano?
A volcano with steep slopes and a tall peak
What is magma?
molten rock found beneath the earths crust
How is lapili calculated?
2-65mm
The VEI scale is based off a _____ to ____ number scale
0-8
What evidence do we have for continental drift?
Similar fossils, climate evidence, rock found in different parts of the world
What is a cinder cone/caldera volcano?
A volcano whose top has been blown off. Leaving a crater at the top instead of the typical small opening
What is Obsidian?
Igneous rock that hardens under immense pressure and heat creating a black glass like substance
How are volcanic bombs calculated?
65mm+
What is the lowest classfication on the VEI scale called?
Hawaiian
How does continental drift happen? (think under the earths crust)
There is a convection-like movement of the magma beneath the surface that causes the plates to move
What is a hot spot?
A thin part in the crust that allows magma to breech the surface. Creates volcanoes.
What is lava?
molten hot rock found on earths surface
What is silica?
A compound that gives magma its thick consistency
What is the highest classification on the VEI scale called?
Mega-Colossal
What are the three boundaries and what do they do?
divergent- pull apart
convergent- hit
transform- rub
How many volcanoes in the world have exposed magma?
3
Describe pyroclastic flow
A dense, destructive mass of very hot ash, lava fragments, and gases ejected explosively from a volcano and typically flowing down slope at great speed.
How do we measure earthquakes?
Seisograph/seismometer