Volcanoes
What is the difference between lava and magma?
Lava: Molten rock OUTSIDE the earth
Magma: Molten rock INSIDE the earth
What is happening to the earth's crust during seafloor spreading?
What is happening to the earth's crust during subduction?
It is being destroyed.
What two types of crust are there?
Continental and Oceanic
What is a volcano that hasn't erupted for a long time, but may erupt in the future called?
Dormant Volcano
What type of plate boundary does seafloor spreading occur at?
divergent plate boundary
True or false: Things that are less dense float
True
Which volcano has steep sides, covered in small rocks?
Cinder Cone Volcano
A long mountain range of underwater volcanoes is called...
Mid-Ocean Ridge
What geologic features form during subduction?
-Deep ocean trench
-Stratovolcanoes
Why is the inner core a solid?
The atoms in the inner core are moving very fast, but it is still solid because of the massive pressure on it.
What are very large pieces of rock blown into the air by a volcano?
Volcanic Bombs
Put these in the correct order:
A) Magma comes to the surface, forms new rock
B) The crust separates/breaks apart
C) Older rock is pushed away to both sides
B) The crust separates/breaks apart
A) Magma comes to the surface, forms new rock
C) Older rock is pushed away to both sides
What is a series of islands created by volcanoes called?
Volcanic Island Arc
Which part of the Earth's core is a liquid?
Outer Core
Name all three types of volcanoes.
-Shield
-Cinder Cone
-Stratovolcano
Name two pieces of evidence that proved seafloor spreading.
-Pillow lava
-Temperature of the water near the ocean floor
-Depth of the ocean floor
-Age of oceanic crust
-Earthquakes in the Atlantic Ocean
Describe the process of subduction.
Tectonic plates are moving toward each other. One goes UNDER the other. The plate going under melts. The magma is forced to the surface through the other plate.
Which part of the Earth's interior is semi-solid?
Asthenosphere