An igneous rock layer formed when magma hardens beneath earth's surface

How does water pollution affect the environment

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.

The causes of the failure of the league of nations