The early paleozoic era was the time of the cambrian explosion. what happened during the cambrian explosion? a.) earth was undergoing lots of contractions as it cooled off. b.) there were frequent earthquakes and lots of volcanic eruptions. c.) earth was bombarded by a great number of asteroids and comets. d.) many new life-forms appeared, including most of the known types of invertebrates.

Why does physical weathering speed up the processes of chemical weathering? a) physical weathering requires abundant water, as does chemical weathering. b) physical weathering produces fresh surfaces for chemical weathering to attack. c) chemical weathering can occur only on small surfaces, not large ones. d) chemical weathering requires salt, which is provided by salt wedging.

Achild’s often are influenced by the belief systems of his or her parents. a. ideologies b. bilingualism c. territoriality d. cultural diffusion

Sandstones that form in aeolian (wind/desert) environments appear very different from other sandstones, such as those formed in a beach/ shoreline environment and in rivers on land. give three identifying properties for each of the three sandstones that would tell a geologist which depositional environment they formed in. consider things such as the relationship between transportation and grain size, shape, roundness, sorting, fossils and composition.