Question | Answer |
what is the process in which layers or sheets of rock gradually break off | exfoliation |
what is the expansion of desert conditions in areas where the natural plant cover has been destroyed is | desertification |
is organic matter that decays and becomes part of soil | humus |
is a naturally formed solid that is usually made up of one or more types of minerals | rock |
which type of weathering actually changes the composition of the rock | chemical weathering |
what causes limestone to dissolve leaving a cavern in the ground | acid in rainwater |
what is formed when the roof of a cave falls in | sinkhole |
the first stage of the erosion process is | weathering |
what are two reasons why a foodplain is a good place to grow crops | 1.plenty of water
2.fertile soil |
the pulling force that causes mass wasting is | gravity |
identify and describe a type of mass wasting | when a rock or rock particles are pulled downward by gravity |
explain how kettle lakes form | when a glacier melts it forms a bowl-shaped depression called a kettle lake |
what is the name that was given to the supercontinent that was believed to have exsited millions of years ago | pangaea |
name that scientist that proposed the theory of continental drift | alfred wegner |
two plates that scrape past each other is what type of bounday | transform boundary |
explain what happens during magnetic reversal | when the poles reverse |
what occurs when one plate sinks beneath another | subduction |
which of earths layers has been described as a shell around an egg | crust |
which of earths layers is the densest | mantle |
hot liquid metal | outer core |
thickest layer | mantle |
thin cool rock | crust |
solid metal very hot | inner core |
a break in earth's lithosphere along which blocks of rock move past each other | fault |
what causes earthquakes | movement of blocks of rock |
all earthquakes occur in which part of the earth | lithosphere |
why dont earthquakes occur in the asthenoshpere | because it is flexible and dosent crack |