Why do oxygen and carbon dioxide move in and out of a plant during the day? a. because the plant is only photosynthesizing c. because the plant is both respiring and photosynthesizing b. because the plant is only respiring d. because the plant is neither photosynthesizing nor respiring

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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