| 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 |
