Answer:
sub-Saharan Africa and the middle east. These regions have most of the world's countries with low HDI's. sub-saharan africa has South Sudan, Central African Republic, and Niger. the middle east has Yemen, Syria, and Iraq.
Answer:
c) No UV light until spring
Explanation:
According to research, chlorofluorocarbons also known as CFCs, are chemicals that are mainly responsible for the destruction of the ozone gas.
<em><u>This is all due to the interaction of different factors, and not only because of the presence of UV. </u></em>
In Antarctica, the ozone levels become significantly reduced during spring because of these chemicals that contain chlorine, producing a hole where cool air becomes trapped. This air produces clouds that are responsible of the release of chlorine from the CFCs, an extremely important process of the formation of an ozone hole. The more clouds there are, the more gases are released, and the worse the ozone hole will be in spring.
Because the sun rises and becomes more intense during spring, it degrades these gases and releases the free radicals of chlorine, which are highly detrimental for the ozone layer as they destroy numerous molecules of ozone. By the beginning of summer, there is a higher amount of ozone that comes from other areas which help fill the ozone hole.
Answer:
Hotter star is more luminous.
Explanation:
A blackbody is an object that absorbs all the radiation incident on it. It does not reflect or let the radiation pass through it.
When the radiations are absorbed, the blackbody heats up. This results in the emission of radiation by the blockbody.
The amount of radiation the black body emits, depends upon the temperature of the blackbody. Therefore, greater the temperature of the blackbody, more the emitted radiation.
A star is very similar to a blackbody. So, if two stars are compared, then the hotter star will emit more light as compared to the cooler star.
Therefore, the hotter star will be more luminous than the cooler star.
