The Earth

Atmosphere and composition of gases

Sedimentary rocks

• Made of seperate grains, made of small sediment that is stuck together
• Are porus - have gaps between the grains that air and water can get in, and are soft 
• Easily scrape grains off the surface
• Often contain fossils and contains layers
• Examples - Limestone, Shale

Metamorphic rocks

• Doesn't contain layers, sometimes contains fossils
• Usually non-porus - no gaps
• Made when heat or high pressure changes a rock that already exists
• Examples - Marble, Slate

Igneous rocks 

• Form when liquid rock cools and freezes 
• Consists of crystals, have no gaps, contain layers, hard
• Made from interlocking grains
• Doesn't contain fossils
• Examples - Granite, Basalt

Rock cycle

• All rocks on the surface are weathered, loose material is eroded
• Deposited into the ocean, over many…