Most strokes and heart attacks are caused by clots in unbroken vessels. this condition is called and pieces may break loose of the vessel wall and travel in the bloodstream as a(n)

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weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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