John rode his bike for 30 miles in 2 hours how fast was he traveling

15 miles per hour

Explanation:in 2 hours he moved 30 miles so just get the half of it

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation:

weathering is the answer.