i. Using fossil evidences
ii. Similar rock lithologies at the edges of continent
iii. Climate clues
iv. Fitting of the continents into a puzzle
v. Sea floor spreading
Explanation:
Pangea was a super-continent on the earth which formed about 330 million years ago during the Paleozoic and began breaking up during the early Mesozoic, about 175 million years ago.
Most of the present day continents formed as a result of the separation of the Pangea in the early Mesozoic.
The first scientist to propose the existence of this super-continent was Alfred Wegener in 1912. He suggested the continental drift hypothesis to explain the separation of the land masses.
Today, the theory has been revised to the theory of plate tectonics which provides a better mechanism to understand the drifting of the continents.
Here are some of the evidences to support the existence of Pangea;
- Using fossil evidences: Mesosaurus, a reptile animal that lived during the Permian, was found in both South America and Southern Africa. Since this animal could not swim nor fly, only a jointed landmass could have made them present in both continents.
- Similar rock lithologies at the edges of continents: rock formations at the Western edge of Africa and South - Eastern part of Brazil matches with one another and have been believed to be once joined together.
- Climatic clues such as glacial tills that are confined to temperate and polar regions have been found in tropical regions.
- Wegener fitted the present day continent into a giant supercontinent and this provided a visual support for his claim.
- Evidences from sea floor spreading revealing magnetic reversals at divergent margins suggests the prevalence of plate tectonics i.e moving plates on earth.
This among many other evidences underscores the existence of a supercontinent called Pangea.
Answer:
Explanation:
Mankind seems to learn very little from anything -- good or bad. There are many things you could say about Natural Gas or Oil, but one thing that neither one could do is create another Chernobyl.
People are saying that the cleanest and most efficient way to go would be to use Nuclear Power Plants. I admit that Gas and oil create their own set of environmental problems, but nothing as far reaching as something lasting 35 years as Chernobyl has done
Scientists are bewildered by Chernobyl heating up again. They cannot explain why let alone what can be done. Each of the alternate energy choices have their problems and have their ill effects on the environment.
Answer:
the answer to this question is c
The closest layer of the atmosphere is called the Troposphere which extends up to about 7.5 miles into the atmosphere. The next layer is called the Stratosphere which extends from approximately 7.5 miles to 21.1 miles into the atmosphere. The next layer is called the Mesosphere which extends from from 21 miles to 49.7 miles up and the final level is the Thermosphere goes from 49.7 miles up to 195.6 miles into the atmosphere.
