In which stage of a stars life does it undergo hydrogen fusion?

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.

The two types of plains are coastal plains and lowland plains

In the diagram below, ab and bc are tangent to o. what is the measure of