Legislation has been ineffective at preserving coral reef

answer; i believe the correct answer is (replication is not conservative);

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

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.