Which definition best describes global warming?
a. a long-term change in the earth's climate
b. a long-term increase in the earth's average temperature
c. a long-term change in the climate of a region or a city
d. solar heat that is radiated out into space

 B a long-term increase in the Earth's average temperature

B

Explanation:

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.