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