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Degger [83]
3 years ago
11

To fully understand the new epoch we are living in, it is useful to compare it to past epochs and consider how human activity is

shaping Earth. Sort the events below based on whether they occurred before or during the Anthropocene.
a. The first oxygen-producing bacteria evolved, creating the oldest fossils on Earth.
b. In the last decade, the black rhinoceros of West Africa became extinct.
c. Sixty-six million years ago, a massive asteroid struck Earth, resulting in the extinction of three-quarters of all plant and animal life, including dinosaurs.
d. Drainage patterns across the globe are altered due to dams and road building.
e, Atmospheric CO2 has increased more quickly, and to higher concentrations, than during any other part of geologic time.
Geography
1 answer:
k0ka [10]3 years ago
8 0

Answer:

A, C, E, D, B

Explanation:

I am not sure exactly what order to put them in based on the formatting of the question because E, D, and B all happened during the Anthropocene period.

A was before the Anthropocene

C was before the Anthropocene

B was during

D was during

E was during

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Imagine that you have obtained spectra for several galaxies and have measured the observed wavelength of a hydrogen emission lin
Lerok [7]

Answer:

A. z (galaxy 1) = -0.00515, z (galaxy 2) = -0.01707, z (galaxy 3) = -0.04008

B. v (galaxy 1) = -0.00517c, v (galaxy 2) = -0.01707c, v (galaxy 3) = -0.0401c

C. d (galaxy 1) = -21 Mpc,d (galaxy 2) = -69.4 Mpc, d (galaxy 3) = -163 Mpc

Explanation:

We begin by listing out the parameters we were given:

λ (obsv) = 656.3 nm, λ (emit 1) = 659.7 nm, λ (emit 2) = 667.7 nm,

λ (emit 3) = 683.7 nm

A) Using the Redshift formula, we have:

z = [λ (obsv) - λ (emit)]  ÷ λ (emit)

For galaxy 1:

z = [λ (obsv) - λ (emit 1)]  ÷ λ (emit 1)

z = (656.3 - 659.7) ÷ 659.7 = -0.00515

z = -<u>0.00515</u>

For galaxy 2:

z = [λ (obsv) - λ (emit 2)]  ÷ λ (emit 2)

z = (656.3 - 667.7) ÷ 667.7 = -0.01707

z = -<u>0.01707</u>

For galaxy 3:

z = [λ (obsv) - λ (emit 3)]  ÷ λ (emit 3)

z = (656.3 - 683.7) ÷ 683.7 = -0.04008

z = -<u>0.04008</u>

B) Using the Doppler formula, we have:

(Δλ ÷ λ) = v ÷ c

v = c * (Δλ ÷ λ)

but, z = (Δλ ÷ λ)

⇒ v = c * z

speed of light (c) = 3 x 10^{8} m/s

For galaxy 1:

v = c * z

Substitute z into the equation calculated from A) above

v =  3 x 10^{8} * (-0.00515)

v = -1.55 x 10^{6} m/s

v = -<u>0.00517c</u>

For galaxy 2:

v = c * z

Substitute z into the equation calculated from A) above

v =  3 x 10^{8} * (-0.01707)

v = -5.12 x 10^{6} m/s

v = -<u>0.01707c</u>

For galaxy 3:

v = c * z

Substitute z into the equation calculated from A) above

v =  3 x 10^{8} * (-0.04008)

v = -12.03 x 10^{6} m/s

v = -<u>0.0401c</u>

N.B: the negative value of velocity connotes that the galaxies are moving away from us (not towards us)

C) Using Hubbleʹs law, we have:

v = H · d

where:

v = velocity of a galaxy (km/s), d = distance (Mpc),

H = Hubble's constant (km/s/Mpc) = 73.8 km/sec

d = v ÷ H

We use the velocities calculated in B) above

For galaxy 1:

v = -1.55 x 10^{3} km/s

d = -1.55 x 10^{3} ÷ 73.8

d = -<u>21 Mpc </u>

For galaxy 2:

v = -5.12 x 10^{3} km/s

d = -5.12 x 10^{3} ÷ 73.8

d = -<u>69.4 Mpc </u>

For galaxy 3:

v = -12.03 x 10^{3} km/s

d = -12.03 x 10^{3} ÷ 73.8

d = -<u>163 Mpc</u>

N.B: distance cannot be a negative value

4 0
3 years ago
A ___ is a settlement ruled by a distant country.<br> - Clan<br> - Colony<br> - Village<br> - Tribe
drek231 [11]

Answer:

Colony

Explanation:

6 0
3 years ago
Read 2 more answers
I need help in this question.
Roman55 [17]

Answer:

Reasons for migration.

Explanation:

Migration is a process that has been happening since the emergence of humankind. The main reasons for it have always been the same - a better life and a safer life. While over time there have been numerous other reasons that have emerged as humans developed more and more, the two basic ones are still the leading ones.

  • When the Soviets decided to deny the rigths of the Jews, the Jews felt insecure, both financially and for their lives, so they had a big push factor to migrate to other countries.
  • Ethiopia is a country where the living conditions are bad, and when the country faces a severe drought the majority of the population experiences famine. Having a lack of food means that your life is at stake, thus people try to move into countries where they will at least have enough food to survive.
  • The war in Bosnia, in which the Muslims, Serbians, and Croatians engaged, resulted in genocides. People were naturally affraid for their lives and the lives of their families, so they did everything they can to migrate to safer countries.
  • Haiti is one of the poorest countries in the Caribbean region. The widespread poverty means poor living conditions, so being so close to well-developed countries like the USA motivates the people to migrate in order to have better opportunities and higher life quality.
4 0
3 years ago
The extraordinary flat land of the west siberian plain stretches from the ural mountains for how many square miles
balu736 [363]
It covers around 1,200,000 square miles.

https://www.britannica.com/place/West-Siberian-Plain
4 0
3 years ago
When applied to a formation of rock layers, what can absolute dating tell you?
klemol [59]
How old the rock is
 thats my answer

8 0
3 years ago
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