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2 years ago

Which phrase best defines erosion?

Geography

2 answers:

natima [27]2 years ago

5 0

A. breaking up rocks into smaller pieces. Let me know if this helped.

Sphinxa [80]2 years ago

4 0

It would most likely be the last one. Erosion is effectively the process of natural forces breaking down rock or soil, which allows it to move from place to place with the aid of forces like wind or water. I would say the answer would be the first one, but it only says rock, while erosion can affect more than just rocks. Hope this helps.

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it is possible for two stars to have different temperatures and different sizes but the same luminosity. explain how.

Darina [25.2K]

Answer:

Two stars (a and b) can have the same luminosity, but different surface area and temperature if the following condition is met:

(T_a^4)(R_a^2) = (T_b^4)(R_b^2)

Explanation:

The luminosity of a star is the total energy that produces in one second. It depends on the size of the star and its surface temperature.

L = σ(T^4)(4πR^2)

L is the luminosity f the star, T is the temperature of the surface of the star and R is its radius.

Two stars can have the same luminosity if the relation between the radius and the surface temperature is maintained.

To see this lets suposed you have 2 stars, a and b, and the luminosities of each one of them:

L_a = σ(T_a^4)(4πR_a^2)

L_b = σ(T_b^4)(4πR_b^2)

you can assume that L_a and L_b are equal:

σ(T_a^4)(4πR_a^2) = σ(T_b^4)(4πR_b^2)

Now, you can cancel the constants:

(T_a^4)(R_a^2) = (T_b^4)(R_b^2)

as long as this relation between a and b is true, then the luminosity can be the same.

6 0

2 years ago

Construction work is being carried out for a railway route passing close to a mountain slope. Why is it necessary to cover the m

iogann1982 [59]

When building some infrastructure, in this case a railway, that is close to a mountain slope, it is necessary to cover the mountain slope with a wire mesh.

The biggest reason for that is the safety.

The steep mountain slopes can be very dangerous, because the rocks undergo the natural processes of weathering and erosion, which causes the rocks to break up and fall downwards. The railway can be locked in that way because there will be rocks on it, so the trains will not be able to pass further. But what is more concerning is that rocks may start falling directly on the train itself, or on the railway but when the train is passing through, and can cause a tragedy. The train may get pushed of the railway, or the rocks may knock it down or get through the windows, so lot of lives can be lost, as well as lot of damage will be done too.

3 0

2 years ago

Earth has always been pretty much the way it is now. Is this right?

Vlad [161]

Answer:

No, Earth has gone through many changes throughout hundreds of thousands of years due to evolution. Some of these changes include land and animal. Earth and all of its environments are always changing and will continue.

- I hope this helps have a great night

7 0

2 years ago

Read 2 more answers

The deserts found in the western united states are primarily the result of being located ________.

topjm [15]

Some of the physiographic features that cause extreme aridity may be found together within a <span>single desert, but t</span>he deserts found in the western united states are primarily the result of being located within the rain shadow of one or more mountain ranges.

6 0

2 years ago

If two places on the ground that are 25° 35'N and 25° 30'N are shown 8 cm a part on a given map, what is the scale of the map?

a_sh-v [17]

Answer:

Explanation:Do you live in a city, or in a small town? Or do

you live on a farm or a ranch? Has your family

lived there a long time or a short time? How does

living where you do affect the way you live? For

example, do you need special clothes in the winter? Is your favorite food grown nearby, or is it

brought in from far away?

All these questions have to do with geography.

Geography is the study of our home—the earth—

and how our lives are affected by it. Almost every

detail of our lives is affected by geography. The

clothes we wear, the food we eat, the things we do

for fun, and the kinds of homes in which we live

are all connected to geography.

8 0

2 years ago