1. The two major causes of desertification are the climate variations and the human activities. The desertification is a process that is a growing concern in the world, as the deserts have been spreading out more and more. One of the reasons are the climate variations. The changes in the precipitation patterns have resulted in reduced precipitation levels at certain places, resulting in the dying out of the vegetation and gradually being replaced with barren land dominated by sand or rocks. The other major cause is the human activity. The humans have been destroying lot of the vegetation because of their own needs, as well as using the waters in the arid and semi-arid regions extensively, resulting in barren landscape with destroyed soil, quickly becoming desert or semi-desert.
2. The basic mechanism of desertification is the change in climate, which is triggering the reactivation of the dormant sand dunes. The climate is constantly changing, and that is not something new, and while it may have positive effects at certain places, it has negative ones in others. When the precipitation levels drop significantly at certain places, the vegetation is starting to die out, and to be replaced by a desert one. The soil is also getting downgraded significantly. This enables the winds to be much bigger factor in shaping the landscape. They start to pick up small particles from the barren land and disperse them, and as they do they create sand dunes gradually, creating a desert.
3. The adverse effects for the humans from the desertification are numerous. With the desertification, the areas become much less suitable for living, in certain occasions almost impossible. The soil is destroyed, thus the agriculture and farming of animals can not be performed, meaning that food can not be produced. The water reserves go significantly down, so there's not enough water for drinking or for the other needs of the humans. The winds are become a big problem, they are much stronger and often cause sand storms, which can even be deadly if someone is caught in the open. The climate is very harsh, the temperatures are very high and it is very dry, or if it is a cold desert, it will have both very high and very low temperatures, depending on the period of the year.
Estuary- the part of the mouth or lower course of a river in which the rivers current meets the seas tide
Gulf- a part of an ocean or sea that extends into the land
Harbor- a deep body of water that protects boats near land
Marsh- type of wetland with soil that is rich in minerals
Mesa- flat topped mountain or hill
Mid-ocean ridge- an elevated region with a Central Valley on an ocean floor at the boundary between two diverging tectonic plates where new crust forms from upwelling magma
Peninsula- an area of land almost completely surrounded by water except for an isthmus connecting it with the mainland
Plateau- area of raised land that is flat on top
Reservoir- a natural or artificial place where water is collected and stored for use
Rift Valley- an elongated valley formed by the depression of a block of the earths crust between two faults or groups of faults of approximately parallel orientation
Strait- a narrow channel connecting two bodies of water
Valley- an area drained by a river and it’s tributaries
Answer:
The diameter of the tire is 1.274 m
Explanation:
Given;
total length of the street, L = 172 m
let the radius of the tire = r
let the diameter of the tire, d = 2r
In every single turn, a tire covers a distance, D = 2πr
for the total 43 times, the distance covered, D = L = 43 x 2πr
L = 43 x 2πr
172 = 86πr
d = 2r = 2 x 0.637
d = 1.274 m
Therefore, the diameter of the tire is 1.274 m
St. Augustine
Augustine, Florida, established by the Spanish in 1565. Today, St. Augustine survives as the nation's oldest continuously occupied city, and is now gearing up for its 450th birthday bash.
The population of the Netherlands is <span>densely packed in a small area. In fact, the Netherlands is the most densely populated region in Europe, and one of the most densely populated in the world. With a population density of 488 people per km^2, the Netherlands has a total population of 16.5 million people.</span>
