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3 years ago

Which of the following statements accurately describes the development of the geologic time scale?

Geography

2 answers:

Vsevolod [243]3 years ago

7 0

The one that has the times in order

Oduvanchick [21]3 years ago

5 0

scientists developed the geologic time scale by studying rock layers and index fossils worldwide

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How long are the white dashed lines that divide lanes on u.S. Roads?

pickupchik [31]

Answer: 10 feet long

Explanation:

The white dashed lines that divide lanes on U.S roads is 10 feet. That happens to be the Federal guideline for every street, highway, and rural roads in the United States, on roads where dashed lines separate traffic lanes or indicate (zebra crossing)—where passing is allowed.

7 0

3 years ago

What delayed the rise of independent nation-states in Eastern Europe?

Inga [223]

Answer:

They loved the Ottomans

4 0

3 years ago

Condensation nuclei, tiny particles of matter in the air, are important because ________. a. they increase the density of air an

nekit [7.7K]

Answer:

Explanation:

Condensation nuclei are important because they form the basic building blocks of clouds. The condensation nuclei are tiny particles on which water vapor molecules form to create the most basic elements of clouds.

Later, other water molecules continue grouping around the original condensation nuclei and get larger to form raindrops.

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3 years ago

3) When the temperature of a blackbody increases from 900 K to 2300 K, by what factor does the total power of the electromagneti

LekaFEV [45]

Answer:

The electromagnetic radiation per-unit- area increase by 42.65 times.

Explanation:

The radiation per-unit- area (P) is directly proportional to the fourth power of the temperature. Thus,

P ∝ T⁴

For, when the temperature is raised from T₀ to T₁ , the radiation per-unit- area is related to as:

$\frac {P_1}{P_0}=\frac {T_1^4}{T_0^4}$

T₀ = 900 K

T₁ = 2300 K

$\frac {P_1}{P_0}=\frac {2300^4}{900^4}$

So,

P₁ = 42.65 P₀

The electromagnetic radiation per-unit- area increase by 42.65 times.

6 0

3 years ago

Which of the following paraphrases Hubble Law?

77julia77 [94]

<h2>Answer: The greater the distance to a galaxy, the greater its redshift</h2>

When we talk about the visible electromagnetic spectrum, we know it starts in violet-blue and ends in red.

Now, in this context the astronomer Edwin Powell Hubble observed several celestial bodies, and when obtaining the spectra of distant galaxies he observed the spectral lines were displaced towards the red (red shift), whereas the nearby stars showed a spectrum displaced to the blue.

From there, Hubble deduced that the farther the galaxy is, the more redshifted it is in its spectrum, and noted that all galaxies are "moving away from each other with a speed that increases with distance", and enunciated the now called Hubble–Lemaître Law.

This means in the past the distance between two galaxies was smaller than at present, being this the proof that the universe is expanding (like a balloon expands when it is filled with air or another gas).

At this poitn it is important to stay clear that the redshift is not produced by the relative movement of the galaxies with each other. This effect is in fact, due to the own expansion of the space among the galaxies.

4 0

3 years ago