The Earth and Atmosphere Crossword Puzzle

QUESTIONS LIST:

• atmosphere : the gas layer that surrounds the earth
• oxygen : the useful gas that we breathe
• nitrogen : the gas that is most common in the atmosphere
• crust : the outer layer of the earths composition
• sedimentary : soft rock that fossils can be found in
• metamorphic : rock that is created under heat and pressure (marble)
• igneous : rock that is made when magma cools
• fossil : the remains of a creature that lived millions of years ago
• carbon dioxide : the gas that humans breathe out
• acid rain : something that can cause damage to statues and rock
• rock cycle : the process by which a rock can change from one type to another