Earth General
Earth's Layers
Volcanoes & Mountains
Earth General 2
Mixed Bag
100
Oceans cover what percentage of the earth's crust?
71%
100
What is the largest layer of the earth?
mantle
100
T or F: Volcanoes are the simplest mountains to understand.
T
100
What gas makes up nearly 78% of the earth's atmosphere?
nitrogen
100
Continental foundations are made mostly of what rock?
granite
200
Rock cooled from magma is called
igneous
200
What two metals make up the core?
iron and nickel
200
Complete the following sentence: Volcanoes are found along zones of ____________________ where the earth's crust has been broken.
weakness
200
Scientists have concluded that the earth's core is made mostly of iron and nickel because of what that is basically a smashed planet?
meteorite
200
How deep is the earth's crust?
30 miles
300
T or F: Heat inside the earth comes from radioactive material
T
300
What layer is the coolest temperature wise?
crust
300
Folded mountains are formed by what from one side?
pressure
300
Eratosthenes is credited as the first to calculate the earth's what?
circumference
300
Dome mountains are mainly caused because _______________ pushes up the sedimentary layers.
intrusive rock
400
Magma that reaches buried rock but does not crack the surface is called?
Intrusive Rock
400
What is believed to be generated by the spinning of the earth's core?
magnetic field
400
Fault-block mountains are formed when rock is raised upward without what?
folding
400
The ocean floor is made mostly of a rock called
basalt
400
Igneous intrusions injected between horizontal layers is called...
dikes
500
What keeps the rocks of the upper mantle from melting?
Pressure
500
Sideways vibrations do not move through what?
liquid (water)
500
Flat top mountains that look like table tops are called
mesas
500
Seamounts are volcanoes that are now...where?
under the sea
500
____________________is the process by which rock is broken up to make sand, clay, and soil.
weathering
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