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    Earth Science: Geology Quiz
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The Earth's ____ is composed of hot liquid iron and nickel. east
The Earth rotates (spins) towards the ____. global warming
Excessive greenhouse gases (CO2 and methane) increase ____. lithosphere
The Earth's atmosphere is 78% ____ and 21% oxygen. nitrogen
Rain that falls on land and flows into a lake is called ____. outer core
Minerals are identified by their hardness and ____ (powder color). runoff
The Earth's ____ is a rock layer about 60 miles thick. silt
The grain or particle size of ____ is between sand and clay. streak

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