Fill in the blank . skeletal muscles are formed by skeletal muscle tissue, and the tissue is made up of skeletal muscle a.)cells; organs b.)organs; cells c.)cells; organ systems d.)organ systems; cells

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.