Find answers, ask questions, and connect with our
community around the world.

Activity Discussion Environment Atmosphere

  • Mahima

    May 26, 2021 at 6:17 pm
    Not Helpful

    The temperature of the atmosphere may be used to split it into tiers. The four layers are troposphere, stratosphere, mesosphere, and last but not least thermosphere. The exosphere is a separate zone that begins roughly 500 kilometers above the Earth’s surface.


    This is where we reside, at the bottom of the atmosphere. Clouds, rain, and snow make up the majority of our weather. The temperature in this area of the atmosphere drops by around 6.5°C per kilometer as the distance above the earth increases. Depending on the weather, the actual temperature difference with height changes from day today.

    The troposphere is home to nearly all of the air in the atmosphere, as well as almost all of the water vapor (which forms clouds and rain). The lowering pressure causes the temperature to drop as you climb higher. When a packet of air rises, it expands (because of the lower pressure). The air cools as it expands. As a result, air higher in the atmosphere is colder than air lower in the atmosphere.

    The boundary layer is the last layer of the troposphere. The tropopause is the top of the troposphere.


    This reaches around 50 kilometers above the tropopause. Stratosphere is mainly responsible for a huge portion of the ozone in the atmosphere. The absorption of ultraviolet (UV) energy from the sun by this ozone causes the temperature to rise with height. Temperatures are greatest over the summer pole and lowest over the winter pole. The ozone in the stratosphere protects humans from skin cancer and other health problems by absorbing harmful UV light.


    The mesosphere is the area above the stratosphere. The temperature drops with height here as well, reaching a low of roughly -90°C at the “mesopause.”


    The thermosphere is a zone above the mesopause when temperatures begin to rise again with altitude. The absorption of energetic UV and X-Ray energy from the sun causes this temperature rise.

    Because powerful solar radiation knocks electrons off molecules and atoms, converting them into “ions” with a positive charge, the area of the atmosphere above about 80 km is also known as the “ionosphere.” The thermosphere’s temperature, as well as the quantity of ions and electrons present, fluctuates from night to day and season to season. The ionosphere reflects and absorbs radio waves, we may hear shortwave radio broadcasts from all over the world in New Zealand.


    The exosphere is the area above 500 kilometers. It is mostly made up of oxygen and hydrogen atoms, but they are so less in quantity therefore they seldom collide. Instead, they follow “ballistic” trajectories under the force of gravity, and some of them even escape into space.


    The earth acts as a massive magnet. The Van Allen “radiation” belts capture electrons (negative charge) and protons (positive charge), concentrating them in two bands about 3,000 and 16,000 kilometers above the earth’s surface. The magnetosphere is the outer zone encircling the earth where charged particles spiral along magnetic field lines.

  • Aashutosh

    May 26, 2021 at 7:50 pm
    Not Helpful

    The blanket of gases that surrounds Earth is known as the atmosphere. Due to the earth’s gravitational attraction, it is held near the surface of the earth. There could be no life on Earth without the atmosphere. The atmosphere is responsible for keeping the climate moderate on earth as compared to other planets.

    The atmosphere is divided into layers which has their respective temperature. These layers are the troposphere, stratosphere, mesosphere, and thermosphere.


    The troposphere is the lowest part of the atmosphere where we live in. It constitutes the essential part of our weather – clouds, rain, snow, etc. In this layer of the atmosphere, the temperature depends on the distance above the earth. Air at the upper layer of the troposphere is cooler than the lower layer.

    The lowest part of the troposphere is known as the boundary layer and the top of the troposphere is called the tropopause. It is found that tropopause is lowest at the poles and highest near the equator.


    Up next layer is Stratosphere that extends upwards from the tropopause to about 50 km. It contains most part of the ozone layer in the atmosphere. Absorption of ultraviolet (UV) radiation from the sun occurs in this layer due to an increase in temperature with height. Temperatures can be found highest in the stratosphere over the summer pole, and lowest over the winter pole.


    The mesosphere is the region above the stratosphere. The temperature decreases with height and can reach as low as about -90°C at the “mesopause”.

    Thermosphere and Ionosphere

    The thermosphere can be found just above the mesopause and is a region in which temperatures increases with height. The absorption of energetic ultraviolet and X-Ray radiation from the sun causes this rise in temperature. The ionosphere can be termed as the region of the atmosphere above about 80 km.


    The next layer is the exosphere and it is termed as the region above about 500 km. It constitutes mainly of oxygen and hydrogen atoms. They follow “ballistic” trajectories under the influence of gravity as there are so few of them that they rarely collide. Some of the atoms even escape right out into space.


    The last and outer region surrounding the earth, where charged particles spiral along the magnetic field lines, is called the magnetosphere. It traps electrons and protons, concentrating them in two bands about 3,000 and 16,000 km above the globe called the Van Allen “radiation” belts.

For Worksheets & PrintablesJoin Now