Instructions For first question, you will use the following words below, as you see fit, to completely fill in the blanks.
theory
continental drift
areas of the sea floor
plate tectonics
lithosphere
mantle
boundaries
Alfred Wegener
Gregor Mendel
Galileo Galilei
For second question, you will use the following words below, as you see fit, to completely fill in the blanks.
Plate tectonics
divergent
earthquakes
geologic
mountains
oceans
ridges
transform
convergent
volcanoes
marine
faulting

Question 1 (10 point)
In the early part of the 20th century, a German scientist, proposed the theory of , which suggested that the continents move and started out in different positions from what they are currently. In the 1960s, scientists discovered the spreading apart of . This in turn led to the theory of . This theory says that the is made up of plates that float on a “plastic-likeundersurface called the asthenosphere. When these plates come together at their changes take place in the crust and its features.

Question 2 (15 point)
Many crustal features can be seen as having resulted from . When two plates come together at a boundary, they collide and form such features as mountains. When two plates move away from each other, the result is a boundary, and they form such features as midocean ridges. A boundary forms when two plates slide past each other. If the pressure between two plates builds high enough, the plates may move rapidly causing and the occurrence of activity. Features such as and can be seen from space and lend support to the plate tectonics theory.

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