Underwater mountain ranges form from sea floor spreading.

Continental rock is made of granite.

The four main layers of the Earth of Crust, Mantle, Outer core, and inner core.

The mantle Is made up of the lithosphere middle of the mantle and then the asthenosphere.
The lithosphere is the crust and upper area of mantle.
Pangea is the theory that the continents were once together which made a super continent or land mass.
Scientists know about the Earth's interior because they can dig down to a certain part and also the earth has earthquakes and volcanoes which show a lot about the earths core.
Alfred Wegner first proposed the theory of continental drift.
Divergent boundaries move away from each other.
Seafloor spreading adds new material to the ocean floor.
Density is the measure of how mass there is in a volume of substance.
Wegener had all evidence except climate change.
In 1960, Hess proposed a radical idea. He suggested that a process he called sea-floor spreading continually adds new material to the ocean floor. In sea-floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added.
Oceanic crust is made out of basalt.
Tuzo Wilson said that the lithosphere was broken into separate parts called
The three types of plates are divergent, convergent, and transform.
Transform plates slide past each other.

when two plates collide the density determines which one goes on top, the more dense one goes under.
when two oceanic crust converge they create a volcano.
Convection currents are the major driving force of plate tectonics.
The lithosphere is the soft upper mantle.
When two continental plates collide they make mountains.
Fault lines are breaks where rocks have slipped past each other.
The theory of plate tectonics stated that Earth's surface is broken in to large, rigid pieces that move with respect to each other.

	Created by Alison Nardella over 9 years ago

Unit 4: Earth's Systems Test