4. describe the view if you were to stand in the umbra of a solar eclipse.

The region in which you stand would be dark even in daytime due to the blockage of the sun by the moon. Solar eclipse occur when the moon is in the center line between earth and sun. When you look up to the sun, it looks like a black circle with a halo on the edges of the circle.  

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.

here's your answer.