Why is there limited vegetation in the tundra?
a.
the soil is frozen and devoid of nutrients.
b.
there is frequent flooding and the soil is nutrient-poor.
c.
there is frequent flooding and the soil is nutrient-rich.
d.
the soil is frozen and contains pockets rich in nutrients.

Ageologist is working in an area with exposed sedimentary rocks and finds a well exposed sequence of stratified rocks. as he works through a thick sequence of limestone, he sees abundant large clam fossils that produce an interlocking texture suggesting a reef, but within the limestone section these clams disappear and the overlying limestone is made up primarily of fragments of corals. he now moves 50 km away and finds limestones interbedded with shales, and the limestones contain the same clam fossils he had seen previously 50 km away. as he continues through this section, the rocks become entirely limestone, and the clams disappear again with coral fossils above forming a reef structure. he concludes

What was a goal of the zapatistas of mexico in 1994? a. to recover land taken by spanish conquerors b. to reform mexico's failing agricultural crop c. to wage war with mexico's southern neighbors d. to reunite latin america under the spanish flag

How much pounds of fluid is in the ocean