Global warming is said to be a long term rise in the annual temperature of the earth. There a number of scientists that have have give statements that the global warming as summarized by IPCC which is endorsed by other scientific bodies, including many climatologists, anthro geographers and other oceanographic experts which have recorded temperature changes over the period of decades and have seen the reaction with various elements like the greenhouse gases on the environment which will risen <u>from 1.5 to 5.8 degrees since 1950 to 2100</u> and rise in annual surface temperature to 3 degrees. Nearly 98% of evidence proves the existence of human impact upon the earth's environment and now the world is moving towards a global cooldown.
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.
