Convection currents occur in the MANTLE. The mantle is the second layer of the earth after the crust. The mantle is approximately 2900 km thick. Convection currents are triggered or fueled by the heat from the Earth's core.
The part of the mantle closest to the core gets heated. It then becomes less dense than the layers above so it rises. When this rising plume interacts with the crust it cools and becomes more dense than the layers below and so it sinks and this circular motion continues to form convection currents.
<span>Erosion by rivers is a main valley-forming
process; other processes, such as movement of the earth's crust and
glaciers, also have an important part in some cases. The rate at which a
river deepens its valley depends on several factors.</span>
Answer:
Adiabatic stability
Explanation:
Adiabatic stability - Adiabatic implies a situation in which the air parcel and the surrounding region do not exchange heat. It will ultimately undergo cooling whenever a parcel of air increases. Latent heat does not release whenever unsaturated air parcel moves in an upward direction.
Cooling will occur quickly as air parcel is unsaturated, the cooling is at a rate of 10 °C / km. This is called the dry adiabatic rate of lapse. Once the parcel of air becomes sufficiently dense it will start sinking.
Well the altitde in <span>the atmosphere in which the stratospheric ozone can be found is 82 km. So the closest would be 70 km.</span>
