| A | B |
|---|
| celestial | pertaining to the spiritual or invisible heaven |
| nitrogen | colorless, odorless, gaseous element that constitutes about four-fifths of the volume of the atmosphere |
| magma | molten material beneath or within the earth's crust, from which igneous rock is formed. |
| core | the central, innermost, or most essential part of anything. |
| atmosphere | gaseous envelope surrounding the earth |
| terra firma | dry land |
| flora | plants of a particular region or period |
| solar system | sun together with all the planets and other bodies that revolve around it. |
| gravity | force of attraction by which terrestrial bodies tend to fall toward the center of the earth. |
| helium | gas used to make balloons float |
