Which american civilizations declined before the europeans arrived in the americas?

Which of the following statements does not describe the raccoon dog

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.

Why slip off slopes are found on the inside of meanders? why river cliffs are found on the outside of meanders?