Question

what is atmosphere define and describe.​

Answer 1

Answer:

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Explanation:

The atmosphere is the blanket of gases which surrounds Earth. It is held near the surface of the planet by Earth's gravitational attraction. Without theatmosphere there could be no life on Earth.

Answer 2

Question:

1️⃣What is atmosphere? Describe atmosphere

Answer:

1️⃣ans: The earth is surrounded by a thick layer of air which is a mixture of several transparent gases. This layer of air is called the atmosphere.

Describing:

In the absence of air, the earth would remain a frozen, lifeless planet in space like any other planet. In fact, the atmosphere that ee live in, is the result of gradual & continous changes which started about 4600 million years ago & were energised by the sun.

OTHER NOTES TO KNOW:

The atmosphere is divided into four different layers, those are:

• Trophosphere
• Stratosphere
• Mesosphere
• Thermosphere

Trophosphere:

It is the densest layer of the atmosphere. This is the portion we live in & is, therefore, most familiar to us. It is this layer of atmosphere where all weather changes continuously take place due to presence of water vapours & dust particles. In the Trophosphere, on an average, the temperature decreases at a rate of 1°C with every 165m ascend. This is called the normal lapse rate. This is why, temperature is very low in high mountains.

Stratosphere:

Above the layer of Trophosphere lies clam & clean air which is called stratosphere. The total a sence if water vapours & dust particles in this layer prevents the formation of clouds. Thus, it provides visibility at its finest. Aircrafts often fly through the lower layer of stratosphere because it facilities visibility and this contributes to easy flying conditions. The zone, which demarcates line of separation between these two layers (Trophosphere & Stratosphere), is defined as tropopause. The temperature is almost constant in the lower part of the stratosphere.

a special form of oxygen, called ozone is found in the stratosphere. This ozone layer is very important as it acts as a filter & absorbs harmful ultraviolet sun rays from reaching the earth's surface. This layer, acts as a shield over the earth's surface. In the absence of the ozone gas in the atmosphere. life would have been impossible on the surface if the earth.

Mesosphere:

Above the stratosphere lies another layer known as Mesosphere. It is a cold layer where temperature generally decreases with increasing altitude. Meteors burn up in this layer.

Thermosphere:

Above the Mesosphere is thermosphere where the air is very thin. In the lower layer of thermosphere (ionosphere), ion-particles are present in concentration. These ion-particles electrically charged & play qan important role in our wireless communication. Radio waves can be sent to different places through these ion-particles. They enable wireless communication over the earth's surface. Beyond the thermosphere, about 1600km above the earth's surface, the earth's atmosphere gradually merges with very thin gases of the outer space.

I hope it helps you friend