Do you believe humans are responsible for global warming or do you believe this is part of a natural cycle of the earth, like periodic ice ages? Use your research to support your opinion.

Explain: plate tectonics and people.

Which of the layers of the earth has the following three characteristics? i. it is made of molten rock. ii. it has currents that are constantly moving. iii. earth’s plates float on top of its currents.

Rocks that contain crystals that are roughly equal in size and can be identified with the unaided eye are said to exhibit a texture.