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jarptica [38.1K]
4 years ago
5

Imagine that scientists have discovered a new planet that is apparently devoid of life but has ice caps located at the poles. Th

ese ice caps reveal that the planet's atmospheric O2 levels sharply increased about 1,000,000 years ago but then quickly dropped 50,000 years ago. What could account for these changes in atmospheric O2 levels?
Geography
1 answer:
Pepsi [2]4 years ago
5 0

Answer:

Photosynthetic organisms was the reason of these atmospheric changes.

Explanation:

The plant which is discovered by the scientists that is apparently devoid of life but has ice caps located at the poles which reveals that planet's atmospheric O₂ levels sharply increased about 1,000,000 years ago was due to evolution of photosynthetic organisms like cyanobacteria etc which went extinct and then O₂ levels dropped quickly 50,000 years ago. So photosynthetic organisms was the reason of these atmospheric changes.

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Zanzabum

Answer:

European Union created an open market where goods and people are being transferred without limitations that existed when the borders were closed. That is why people can freely travel, get jobs and many other benefits inside the member countries of EU.

Explanation:

The idea of EU started developing after WW2, and the countries that started developing that idea were France, Germany and Benelux countries.

It has developed into one of the most important economic forces in the world, and also unified Western Europe in a common struggle for a better life.

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Chain migration involves the place transition from, for example, rural to central city residence through a series of less extrem
WARRIOR [948]

Answer:

False

Explanation:

Chain migration is the social process by which migrants from a particular town follow others from that town to a particular destination, it assures that the mover is part of an established migrant flow from a common origin to a prepared destination,the prepared destination may be in another country or in a new location within the same country

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4 0
4 years ago
Large- scale floring of rocks during the process if mountain biulding is characteristick of ____ metamorphism
Lunna [17]
<h2>Answer</h2>

The answer is Regional Metamorphism

<h2>Explanation</h2>

In the metamorphism, the rock is altered with the effects of natural agencies. Regional Metamorphism is the type of metamorphism, where the rocks are also changes with the interaction of high pressure or heat on the open wide area instead of contact with the magma. These rocks are also changes with the overburden of plate tectonics. In this question, the large-scale folding of rocks represents Regional Metamorphism.

6 0
3 years ago
What are folded mountains made from?
BlackZzzverrR [31]

Answer:

Fold mountains are formed when two plates run into each other or collide

Explanation:

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