Answer:A. differing densities of the elements that make up the Earth.
Explanation: The densities of the different materials making up the Earth surface and the Earth crust, due to the varying density of these materials it makes it difficult to break certain types of materials.
When the time required to break down materials differ,the earth's surface will have different layers caused by the time difference between the breakdown of these materials.
The more the density of the material the more difficult it is to break it down.
Answer:
(a) Desert- In a desert environment, the temperature is relatively very high during daytime due to high absorption of sunlight and at night it again cools down. There is little or no precipitation here. This region includes the equatorial and some parts of the tropical region.
(b) Arctic tundra- This region lies in the higher latitudinal areas extending from the arctic to the extreme poles. The temperature here is extremely cold and precipitation is low. The plants and trees here are short in height.
(c) Temperate grassland- These are the mid-latitude areas covering the extensive grasslands of both the northern and the southern hemisphere. The temperature and precipitation level here are both moderate.
(d) Tropical rain forest- These are the regions that covers the vast rain forest areas in the tropical region of both the hemispheres. The temperature here is high is relatively high and high moisture content. As a result of which the rate of evaporation is high and rainfall is maximum. The region is rich in diverse trees and plants species.
(e) Temperate deciduous forest- These are the regions covering the mid latitudes that are rich in the deciduous forest. These are the dry forests comprised of various plant species. The temperature in this region is very moderate and summers are comparatively much cooler. Precipitation in this region is also quite moderate.
Most countries in Asia and Africa were colonies under the control of European nations for a long time. People of the colonized countries struggled to gain independence. India was one of the few colonies where people carried a nationalist struggle to liberate the country from the colonial rule.
Answer:
In much of the lower Southeast, the climate is typical of a humid subtropical zone
1. School on weekends 2x a month
2. 16 hour work days
3. Students clean the school after each day instead of janitors
