https://padlet.com/tyrabest/ox2tj6p1xauh en-us 2017-01-18 15:18:56 UTC 2017-01-18 15:34:14 UTC hello@padlet.com tyrabest https://padlet.com/tyrabest/ox2tj6p1xauh/wish/147835876 Fairly soft 
Many break apart and crumble
only type that contain fossils ]]> 2017-01-18 15:19:07 UTC https://padlet.com/tyrabest/ox2tj6p1xauh/wish/147835876 tyrabest https://padlet.com/tyrabest/ox2tj6p1xauh/wish/147836733 Formed under the surface of the earth 
Occurs due to intense heat and pressure
Has processes have ribbonlike layers 
Shiny crystals  

]]> 2017-01-18 15:21:26 UTC https://padlet.com/tyrabest/ox2tj6p1xauh/wish/147836733 tyrabest https://padlet.com/tyrabest/ox2tj6p1xauh/wish/147837622 formed when magma cools and hardens
Cools inside the earth 
Erupts into the surface
No crystals 
Gas bubbles are in the rock]]> 2017-01-18 15:24:06 UTC https://padlet.com/tyrabest/ox2tj6p1xauh/wish/147837622