Igneous, Metamorphic, and Sedimentary Rocks. Igneous Rock. Igneous rocks come from two major sources: Magma Lava Who can explain the difference between the two? Magma comes is liquid rock beneath the surface, it becomes Lava when it reaches the surface of the Earth.
Who can explain the difference between the two?
Magma comes is liquid rock beneath the surface, it becomes Lava when it reaches the surface of the Earth.
The longer magma stays liquid, and the more gas that is trapped within it, the larger the crystals. (Example: The grains in Granite are crystals)
Formed by the hardening and cementing of layers of sediments. Consist of rock fragments, plant and animal remains, or chemicals that form on lake and ocean bottoms.
4. What type of rock does this crayon resemble? (Think about the size of the crystals. Can you see them? Are they grainy, smooth, glossy?)
5. Choose one of your crayons and scrape a moderate pile onto your foil. This will be your parent rock. (You do not need to scrape the entire crayon out of existence)
6. Now make a secondary pile off of the foil. This pile should be smaller.
What do these two piles represent? From what type of rocks could these have come from?
7.Mix them together on the center of your foil, and fold the foil together. Apply pressure and flatten the crayon shavings.
8.Open the foil – describe what you see. What type of rock does this represent?