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There are 195 countries in the world.
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The crust makes up the land layer of the earth, also the top layer.
Answer:
Megacities have an impact on public health, like contamination of water. Overpopulated places can bring diseases and a lack of health protection.
Explanation:
Megacities are the base for gas emissions that could be very dangerous for the environment. Traffic jam is getting worse day by day. Almost half of the habitant of one city spends at least one hour in the car to get to work.
Answer :
Earth's different atmospheres and various layers of the air.
Explanation:
The air is contained layers in light of temperature. These layers are the troposphere, stratosphere, mesosphere, and thermosphere. A further area at around 500 km over the Earth's surface is known as the exosphere. The atmosphere can be separated into layers in light of its temperature, as showed up in the figure underneath. These layers are the troposphere, the stratosphere, the mesosphere, and the thermosphere. A further area, beginning around 500 km once again the Earth's surface, is known as the exosphere.