Is a fact that is based on your five sense. *
Observation
Compound
Inference
Control

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

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.