Actually, the increase in life expectancy in Botswana happened in the past (between 2000 and 2010 - in any case, the major reason was the decrease in infant mortality).
In the last years, since 2010 it has fallen again, mostly due to an increase in the occurence of AIDS and violent deaths such as road accidents.
Answer:
GPS makes the reading of maps very accurate.
Explanation:
An electronic version also allows the information to be upgraded regularly to give accuracy and reliability than a paper map that could be outdated. There is a less human error with machines designed to survey large areas of land. The internet is a great way to be able to access information rapidly and efficiently. Traditional maps are limited to the type of information it can show. However, with GPS mixed with GIS and the internet maps can show a great variety of information, such as the type of soil or geology in a certain area. It is also possible to read the information and connect it, such as a route planning feature to help a driver get to their destination.
The answer is C, dense snow. ;)
Troposphere is the layer where the air is thin as well as very warm
Answer:
b. grains traveling short distances (approximately 1 m) in the air
Explanation:
Wind is a very efficient erosion agent, and its action, particularly in areas of arid, semi-arid and desert climates, is responsible for transporting and depositing large volumes of sediments with the development of a typical wind landscape.
The diameter of the sand grains transported by the wind averages between 0.15 and 0.30 mm, with some fine grains up to 0.006 mm, all particles smaller than 0.006 mm are classified as dust. A grain the size of the dust is carried high in the air and a grain the size of the sand is carried forward near the ground by jumping (see figure 1). As the particle size increases, the attraction of gravity and air resistance also increase.
The soil surface particles are transported by the wind in three ways:
- By drag: the thickest particles (500 - 2000 microns).
- By saltation: medium particles (100-500 microns).
- In suspension: the smallest and lightest particles (<100 microns, 0.2 mm).
The <u>saltation</u> moves the particles by small jumps, in the direction of origin of the wind and normally does not remove them more than 1 centimeter above the ground. An individual grain rolls forward driven by the wind, until it bounces with a second grain. Once in the air, it is carried forward by the wind and drawn to the ground by gravity. It follows a parabolic path falling on the ground with an angle between 10º and 16º, and usually traveling short distances.
