Answer:
B. Pangaea
Explanation:
Pangaea or Pangea was a supercontinent that existed during the late Paleozoic and early Mesozioc eras. It assembled from earlier continental units approximately 335 million years ago, and began to break apart about 175 million years ago.
I think it is Racial background
The circulatory motion of descending cool air and ascending warm air is known as convection.
Because of the circulatory motion of the Earth and the varying amounts of heat that different regions of the world experience, diverse weather patterns, jet streams, deserts, and prevailing winds exist. Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids.
Conduction is used to move heat from the object to the fluid initially, but fluid motion is responsible for the bulk of the heat transfer. Convection can occur naturally or artificially. The phenomenon of the sea and land breeze is one of the most prevalent examples of natural convection.
Know more about convection here
brainly.com/question/4138428
#SPJ4
Answer:
Explanation:
Stratospheric ozone is important because it acts as the blockade to harmful UV radiation directly from the Earth. If there were no stratospheric ozone then the life on the Earth was not possible because direct exposure to UV rays cause Skin cancer and many more health problems to humans and animals and plants. Thus, Stratospheric ozone is very important because it absorbs the penetration of harmful UV radiation as well as other harmful radiations. Whereas, the ground level Ozone becomes a harmful gas because it has adverse effect on the Human lungs. Old aged people, children, outdoor working people etc. mostly get effected in their breathing and taking smooth air from the environment.
The role of Ozone depletion in the stratosphere by the CFCs is very crucial because 1 molecule of CFC can destroy 100,000 molecules of Ozone by a simple chemical reaction in the presence of UV. More the CFCs in the environment and in the Stratosphere cause more Ozone depletion. And, this may lead to penetration of harmful UV rays into the Earth surface.
When the connection between CFCs and ozone depletion was well understood, many of the people (scientists, business persons, public, politicians) started to adopt the tecchnology which do not produce CFCs. Till few years ago, our refrigerator, AC and other instruments used to produce enough CFCs but, nowadays this has been significantly reduced. Similarly, the burning of plastics and other CFCs producing fuels has been banned or reduced. All the concerned authorities made strong rules to reduce CFCs in the environment and in the Atmosphere. And, this led to decrease in the depletion of Ozone on the stratosphere.
