unit 3 plate tectonics

2. Volcanic Activity occurs via vents that act as a conduit between the Earth's surface and inner layers, and erupt gas, molten rock, and volcanic ash when gas pressure and buoyancy drive molten rock upward and through zones of weakness in the Earth's crust.
4. the solid, metallic, innermost layer of the planet, composed primarily of iron and nickel
5. the age of the Earth's oceanic crust.
8. linear areas on Earth's surface where tectonic plates or sections of a volcano are pulled apart, creating weaknesses where magma can rise.
10. a long, deep depression in the ocean floor formed by the subduction of one tectonic plate beneath another, resulting in the deepest parts of the ocean
11. Earth's thick, less dense, and silica-rich outer layer that forms the continents
12. a liquid layer of molten iron and nickel, located between the solid mantle and the inner core

1. massive, irregularly shaped slabs of solid rock that form the Earth's lithosphere, composed of both continental and oceanic crust
3. a place where two tectonic plates move toward each other, colliding and causing features like mountain ranges, deep ocean trenches, volcanic activity, and powerful earthquakes.
6. the thin, dense layer of Earth's outermost shell that lies beneath the oceans, formed at mid-ocean ridges from basalt and gabbro, and destroyed by subduction at trenches
7. a tectonic plate boundary where two plates move apart from each other, causing magma to rise to the surface to create new oceanic crust
9. a geological fault where two tectonic plates slide horizontally past each other, rather than moving toward or away from one another