In which layer of the atmosphere convection current is seen?

Generally convection is limited to the troposphere, which is the lowest layer of Earth’s atmosphere and contains 80 % of the atmosphere by mass. Warm air is less dense than cool air, so it rises higher in the troposphere. This starts a convection current. The wind is mainly caused when the reflected radiation of the light from the sun heats up the air, thus displacing the cooler air.

Write with reason in which layer among the layers of the atmosphere the pressure is the highest.

Troposphere is the layer of the atmosphere in which the pressure is the highest. In the atmosphere, the air pressure at any point is caused by the weight per area of the air above that point. As we go up the layers of the atmosphere, fewer air molecules are above us. So, there will be less weight of air above us. Hence, atmospheric pressure always decreases as we move upward in the atmosphere.

Name an energy source that can be used for sustainable development.

The energy source that can be used for sustainable development are renewable energy sources such as wind, hydroelectric power, solar, and geothermal energy are generally far more sustainable than fossil fuel sources.