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Yes they can.
Cracks in rocks of the crust are known broadly as discontinuities. If there is relative movement of the rocks on the two sides of the crack, then it is known as a fault. If there is not then it is known as a joint.
If you are talking about an earthquake, the focus right above it is the epicenter
Plants are the organisms which have roots and can crack rocks
Changes in pressure which can cause rocks to crack is an example of mechanical weathering. It refers to the disintegration and decomposition of rocks.
No, not if it is a big crack
Crack is cocaine which has been processed with baking powder into small nuggets called rocks.