By what process do rocks become igneous rocks? a) lithification. b) uplift and erosion. c) contact metamorphosis. d) melting, cooling, and crystallization

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 lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south

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