Which feature is formed when a moraine of an earlier glacier is shaped by a later glacier?
a. a lake
b. an esker
c. a drumlin
d. a hanging valley

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.

In north america, most winter storms form when cold, dry air from interacts with warm, moist air from

Which of the following terms describes the layers of air surrounding the earth ?