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3 years ago

How has the world’s population expanded so quickly over the past 200 years?

1 answer:

3 0

during the early 1900s the population has roughly 1.5 billion people but between the 1900s and 2000 it jumped all the way to 6 billion in 100 years.

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A(n) is a bend in a steep narrow bedrock valley. 2. The lowest level to which a stream can erode is called . 3. A(n) is the remn

borishaifa [10]

Answer:

1. Incised meander.

2. Base level.

3. Terrace.

4. Lake

5. Meander.

6. Floodplain.

Explanation:

Erosion can be defined as a geological process which typically involves the wearing out of earthen (soil) materials and the transportation of these materials by natural forces like water, wind, etc. Soil erosion is greatest when the soil is steep.

The steepness of a body such as river or stream refers to the downward slope or gradient of the body of water.

Generally, the steepness of a body affects the rate at which other materials would flow or move around. Thus, the steeper a river or stream, the greater would be its rate of erosion.

Some of the characteristics of an erosion include the following;

1. An incised meander is a bend in a steep narrow bedrock valley. It avails a river large amount of vertical erosion power and as such enabling a downcut.

2. The lowest level to which a stream can erode is called a base level. Some examples are dam, waterfall, lake, stream, etc.

3. A terrace is the remnant of a former floodplain.

4. Examples of local base level include a stream or a lake.

5. A sweeping bend of a stream which is migrating laterally in a wide, flat valley is called a meander.

6. The flat, broad area surrounding a stream is referred to as a floodplain.

3 0

3 years ago

a rural kansas watershed that is ungauged has an area of 475 acres and a main channel length of 6870 feet with an average slope

dlinn [17]

Answer:

$\mathbf{Q_p =682 \ \ ft^3/s}$

Explanation:

Given that:

Area = 475 acres

The length of the channel (L) = 6870 feet

The average water shield slope (S) = 100 feet/mile

Since; 1 mile = 5280 feet

Burst duration D = 15 min

∴

100 feet/mile = 100/5280

The average water shield slope (S) = 5/264

Using hydrograph method:

The time of concentration $t_c = 0.0078L^{0.77} S^{-0.385}$

where;

L = 6870

S = 5/264

$t_c = 0.0078(6870)^{0.77} (\dfrac{5}{264})^{-0.385}$

$t_c =32.34$ min

Since 60 min = 1 hour

32.34 min will be (32.34*1)/60

= 0.539 hour

Lag time $T_l = 0.67\times t_c$

$T_l = 0.67\times 32.34$

$T_l = 21.6678\ min$

The time to peak i.e

$T_p = \dfrac{D}{2}+ T_L \\ \\ T_p = \dfrac{15}{2}+ 21.6678 \\ \\ T_p = 29.168 \ min$

$T_r = \dfrac{T_p}{5.5} \\ \\ T_r = \dfrac{29.1678}{5.5} \\ \\ T_r = 5.30 \ min$

Since D = 15 min is not equal to $T_r$ , then we hydrograph apart from $T_r$ duration lag time.

Then;

$T_p \ ' = T_p + \dfrac{D-t_r}{4} \\ \\ T_p \ ' = 29.168 + \dfrac{15-5.30}{4} \\ \\ T_p \ ' = 31.593$

Now, we need to determine the peak discharge $Q_p$ by using the formula:

$Q_p = \dfrac{484 \times A}{T_p \ '}$

where

484 = peak factor

Recall that A = 475 acres, to miles, we have:

A = 0.7422 mile²

$T_p \ ' = 31.593/60$

∴

$Q_p = \dfrac{484 \times 0.7422}{\dfrac{31.593}{60}}$

$\mathbf{Q_p =682 \ \ ft^3/s}$

7 0

3 years ago

Latin Americans have created different elevation zones to describe the climates that they live in. Which of the following patter

Paul [167]

Answer:

D. tierra caliente, tierra templada, tierra fria, tierra helada.

Explanation:

The Latin American region has its own unique names for the elevation zones based on the climate. The lowest of them is the tierra caliente, characterized with lowlands and hills covered with dense tropical forests, and hot weather. The tierra caliente is the second, located between 1,000 and 2,000 meters, being still part of the tropical climate, but being cooler and more pleasant, which is why there are lot of big cities on this elevation. The tierra fria is located further up, up to 3,000 meters, and it is colder, dominated with grasslands, and the living conditions are not the best. The top elevation zone is the tierra helada, located in the highest parts of the Andes, being dominated by barren mountain slopes, strong winds, and cold climate.

4 0

3 years ago

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I am giving 20 points pllzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz helpppppp

VMariaS [17]

The correct answer is: A. Lunar phase.

7 0

3 years ago

(Choose all that apply). The countries of the Arabian Peninsula have these things in common.. . 1.Arabian Desert. 2.desert terra

coldgirl [10]

The correct answers among all the other choices are 2. desert terrain, 3. dry climate, and 5. petroleum reserves. <span>The countries of the Arabian Peninsula have these things in common. </span>Thank you for posting your question. I hope that this answer helped you. Let me know if you need more help.

5 0

3 years ago

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