When does the northern hemisphere have the coldest climate

Seed plants that lived during the carboniferous impact life on earth today because a. they are the ancestors of all plant life on earth. b. their remains formed coal, which is an important resource. c. they produced fossils that are used to date many geologic events. d. their presence caused oxygen levels to drop, allowing animals to evolve.

How are farmers that use no plow farming methods able to improve air quality for the people around the fram

How do convection currents form underwater mountains?