There are three main types of reservoirs; valley-dammed reservoirs, bank-side reservoirs, and service reservoirs. Valley-dammed reservoirs are created in valleys between mountains. Usually, there is an existing lake or body of water.

4 0

2 years ago

A cylinder has a height of 12 cm and a total surface area of 172 cm 2 . What is the radius of the base of this cylinder?

Eduardwww [97]

Answer:

466.5 cm^2.

Explanation:

surface areas

base surface area : 466.5 cm^2

lateral surface area : 649.6 cm^2

total surface area : 1116.1 cm^2

radius

8.617 cm^2

8 0

2 years ago

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Compare predictions about population growth in Africa and Asia

Gelneren [198K]

1.Africa’s population as a whole is projected to grow very rapidly in the coming 85 years, from 1.2 billion today to 4.4 billion people in 2100 — an increase of 266%.

2.At the end of the current century, Africa’s population will be equal to the total world population back in 1980.

3.By 2100, Africa will — if UN projections bear out — account for almost 40% of the world’s 11.2 billion population.

4.Despite a falling population in China, Asia’s overall population is projected to rise from 4.4 billion today to 4.9 billion in 2100, an increase of 11%.

5.While Asia will retain its status as the most populous region, Africa is catching up. Today, Africa’s population is one-quarter the size of Asia’s.

6.By 2100, Africa will have a population that is just 10% smaller than Asia’s.

7.Nigeria will move from being the world’s seventh most-populous country today to its third most-populous country in 2100 (behind only India and China).

8.And while Nigeria is the only African nation among the top 10 today, it will be one of five in 2100.

7 0

2 years ago