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Earth (layers, etc)
Question | Answer |
---|---|
This is the thinnest, least dense layer of the earth | crust |
This is the middle, thickest layer of the Earth | mantle |
This is the inside layer of the Earth | core |
The inner core is a solid ball of | nickel and iron |
The outer core is mostly nickel and iron in what form? | liquid |
What causes Earth's plates to move slightly? | convection currents |
When two of Earth's tectonic plates come together it forms what type of boundary? | convergent |
When two tectonic plates move away from each other, it forms what type of boundary? | divergent |
When two tectonic plates slide horizontally past each other they form what type of boundary? | transform |
When an oceanic plate sinks below a continental plate it is called | subduction |
Another word for weak spots in the plates (where earthquakes form) | faults |
What is the study of earthquakes called? | seismology |
underwater mountain chains | mid-ocean ridges |
The name of the super continent when all of the plates were connected | Pangaea |
Which earthquake waves are the most destructive? | surface waves |
which are the first (primary) waves of an earthquake? | P waves |
What are the second waves to arrive in an earthquake? | S waves |
The theory that the continents were once connected and slowly drifted to their current location. | continental drift |
Where do most earthquakes and volcanoes occur? | plate boundaries |
magma that has erupted from a volcano is called what? | lava |
what type of eruption produces lava? | nonexplosive |
what is material that has been shot out of a volcano and hardened in the air? | pyroclastic material |
What type of eruption produces pyroclastic material? | explosive |
the pieces that make up the Earth's crust | plates |
cracks in the Earth's surface | faults |
This type of crust is more dense than continental crust. | oceanic |
When one plate is pushed down under another plate | subduction |