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What is the coolest part of the earth?

The coolest part of the Earth is its polar regions, specifically the Arctic and Antarctic regions. These areas have extremely low temperatures due to their proximity to the poles and receive minimal sunlight during certain times of the year, resulting in icy conditions and unique ecosystems adapted to the cold.


Is the ozone layer same as the Mesoshpere?

No, the ozone layer is a region in Earth's stratosphere that contains a high concentration of ozone gas, which helps protect us from harmful ultraviolet radiation. The mesosphere is a layer of Earth's atmosphere above the stratosphere and below the thermosphere, characterized by decreasing temperatures with altitude.


What is the uppermost atmospheric layer?

The exosphere is Earth's uppermost atmospheric layer. The thermosphere is the largest layer of the Earth's atmosphere and lies between the exosphere and mesoshpere. Since there is no clear boundary between the exosphere and outer space, there are some who argue that it is part of outer space. However, it does have gases that slowly drift into space, eg. hydrogen and helium throughout and some carbon dioxide and oxygen at the exobase. So, most would argue that the exosphere is part of Earth's atmosphere, and that the controversy is largely a matter of semantics, and awaits improved definition.


What layer of earth atmosphere blocks meteors from hitting the earth?

All layers of the atmosphere. Depending on the angle at which a meteoroid enters the earth's atmosphere, it follows a trajectory towards the earth's surface. While doing so, aerodynamic friction heats it up and it becomes a meteor. It may fragment and burn up entirely but otherwise, it will remain a meteor all the way down to the earth's surface and, when it strikes, it will become a meteorite.


What do you think Earth's surface would be like if Earth did not have an atmosphere?

It depends on what part of the Earth you are referring to. If the sun suddenly 'blinked out' the atmosphere would literally condense and fall to the ground and the surface temp would hover just a bit above absolute zero. However, this wouldn't spell the end of life on the planet. Geothermal activity would go on as usual. The Earth's core would continue to generate tremendous heat supporting extremeophiles and even liquid water. So the answer is, dig deep enough, stock up on food, and stay warm!