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3 years ago

What is the oldest continuously inhabited settlement in the United States?

1 answer:

4 0

St. Augustine

Augustine, Florida, established by the Spanish in 1565. Today, St. Augustine survives as the nation's oldest continuously occupied city, and is now gearing up for its 450th birthday bash.

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Entre 1908 e 1912, foi proposta pelo geólogo alemão Alfred Lothar Wegener a teoria da deriva continental. Nesta teoria, ele afir

ale4655 [162]

Answer:

verdade

Explicação:

A afirmação é verdadeira de que o estudo dos fundos marinhos trouxe evidências de que as cordilheiras oceânicas são regiões onde a nova crosta oceânica é formada. Essa nova crosta oceânica é formada nas cordilheiras do meio do oceano devido à erupção vulcânica no fundo do mar no processo de propagação do fundo do mar. Nas cordilheiras do meio do oceano, um novo fundo do mar é formado continuamente durante o processo de propagação do fundo do mar.

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3 years ago

Animals such as penguin and seals would most likely be found in and around _____. glaciers pack ice crevasses convergence zones

Sonbull [250]

Those animals are found around glaciers

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3 years ago

Read 2 more answers

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 = -0.00515

For galaxy 2:

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

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

z = -0.01707

For galaxy 3:

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

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

z = -0.04008

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 = -0.00517c

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 = -0.01707c

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 = -0.0401c

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 = -21 Mpc

For galaxy 2:

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

d = -5.12 x $10^{3}$ ÷ 73.8

d = -69.4 Mpc

For galaxy 3:

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

d = -12.03 x $10^{3}$ ÷ 73.8

d = -163 Mpc

N.B: distance cannot be a negative value

4 0

3 years ago

Can humans survive without plans?explain your answer

Mnenie [13.5K]

Answer:

Well.....

Explanation:

There is a possible chance that humans would survive with out plans but they could also not survive without plans. I chose to be on the side where humans wouldn't survive without plans. The reason that they would not be able to survive would be because if they had no plans and most people rely on the plans for surviving that why I think they wouldn't survive.

But on the other hand, if they knew surviving skills or at least had a back up plan if they lost their plans, they would definitely survive. I hope this is the answer your looking for, This knowledge came from my head.

3 0

3 years ago

A sea that is almost completely surrounded by land is called what

Anna [14]

Answer:

Its called a landmass

Explanation:

6 0

3 years ago