Limestone can form whenprecipitates from water, or when sea shells or skeletons made ofaccumulate on the ocean floor. can form from skeletons of marine microorganisms that are made of silica, or when silica precipitates from water. Gypsum anddeposits can form in hot, dry climates when water trapped in closed basins evaporates.

The map above shows where people live in the united states. areas that are darker blue are areas where people live close together. areas that are lighter colors are places where people live farther apart. as a geographer, if you were to study where people live and why they choose to live in these places, which of the six essential elements of geography would you be using?

What statement about charlemagne is not true? a. charlemagne's empire collapsed during his rule b. charlemagne sent missionaries throughout europe c. charlemagne encouraged the arts and education d. charlemagne ruled much of western europe a. charlemagne's empire collapsed during his rule

In russia which of these challenges affects the transportation of both petroleum products and other goods? a poorly repaired roads b harsh weather and vast distances c frozen waterways d separatist movements