Help me pls Which economic system is used in the United States?

Traditional Economy
Market Economy
Domestic Economy
Command Economy

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.

Asap will mark geography final plz ! what are the benefits of international aid? (give me the right evidence )

What is the pattern of urbanisation around the word?