Coal a. is a renewable resource b. can easily be replenished c. is formed from plant remains d. is the least-polluting energy source

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.

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

The blue segment below is a diameter of oo. what is the length of the radius of the circle?