B is the answer because......
Explanation:
The physical environment of forests is determined by edaphic (soil) factors and micro-climate (precipitation, light, temperature, and wind). Gas-exchange within forest canopies depends upon the microclimatic condition within the forest, as well as, edaphic factors and water availability.
Answer:
The purpose of both the Truman Doctrine and Marshall Plan were to curb the spread of Communism.
Explanation:
The Truman Doctrine was an American foreign policy which stated purpose was to contain Soviet geopolitical expansion during the cold war.
The Marshall Plan was a Economic recovery plan to help recover Western Europe's devastated economy after WW2, and was only available to non-communist nations
Answer:
There are several tectonic provinces collectively called as crystalline providences.
Explanation:
- The geology of Appalachians consists of Blue Ridge, Piedmont, Adirondack, and the New England providences. They are known as Crystalline provinces.
- The sinking of the oceans continued about 270 million year ago due to which a huge mass of rocks was pushed westwards along the margins of North America and piled up to form the mountains.
- The Sierra Nevada is the youngest mountain range on the west coast of the United States.