study of the processes which formed the Earth's crustal rocks and surface landforms
referring to the movement and changes in the Earth's crust
usually covered by a thin layer of soil or by a body of water
the thin, fragile, outermost layer of the Earth
Earth's crust consists of ______.
below the thin layer of soil and water that cover the surface of the Earth
Oceanic crust is ______ than the crust below the continents
It is about 5 km thick.
Oceanic crust is made of ______ covered with a very thin layer of salt sediments.
consist primarily of granite
It is about 32 km thick.
Granite is _______ (lighter) than basalt
it appears to rise to higher elevations or float on the mantle
movement of ______ on the mantle is called plate tectonics
Large pieces of Earth's crust
Tectonic Plates _____ on top of the Earth's upper mantle
There are _____ large tectonic plates and many smaller ones.
theory that the continents were once a single, large landmass and slowly drifted apart
_____ appear to line up when the continents are placed back together in a single landmass
Scientists have also found ____ in eastern South America which match those found in western Africa.