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3 years ago

SPOIL

Geography

1 answer:

levacccp [35]3 years ago

4 0

Answer:

Land & plant fossils found across oceans

Explanation:

Abundant proof supports the significant conflicts of the ocean bottom spreading hypothesis. To begin with, tests of the profound seafloor show that basaltic maritime outside and overlying dregs become dynamically younger as the mid-sea edge is drawn nearer, and the silt spread is more slender close to the side. Second, the stone making up the sea depths is impressively younger than the landmasses, without any examples found 200M years, as appeared differently concerning most significant times of more than 3B years for the mainland rocks.

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Why are the rivers so vital to europe's economy?

slega [8]

Danube River, German Donau, Slovak Dunaj, Hungarian Duna,Serbo-Croatian and Bulgarian Dunav, Romanian Dunărea,Ukrainian Dunay , river, the second longest in Europe after the Volga. It rises in the Black Forest mountains of western Germany and flows for some 1,770 miles (2,850 km) to its mouth on the Black Sea. Along its course it passes through 10 countries: Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova, and Ukraine

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3 years ago

Give two examples of geographic representations other than a map.

Zielflug [23.3K]

Answer:

lobes, graphs, diagrams, and aerial and satellite images

Explanation:

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2 years ago

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3 years ago

Calculate the amount, in grams, of an original 300-gram sample of radioactive isotope Potassium-40 remaining after

Aleksandr [31]

Answer:

The current amount of the Potassium-40 sample is approximately 37.521 grams.

Explanation:

The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time ( $m (t)$ ), in grams, is described below:

$m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }$ (1)

Where:

$m_{o}$ - Initial mass, in grams.

$t$ - Time, in years.

$\tau$ - Time constant, in years.

The time constant can be found from half life ( $t_{1/2}$ ), in years, described in statement:

$\tau = \frac{t_{1/2}}{\ln 2}$ (2)

If we know that $m_{o} = 300\,g$ , $t = 3.9\times 10^{9}\,yr$ and $t_{1/2} = 1.3\times 10^{9}\,yr$ , then the current amount of the sample is:

$\tau = \frac{1.3\times 10^{9}\,yr}{\ln 2}$

$\tau \approx 1.876\times 10^{9}\,yr$

$m = (300\,g)\cdot e^{-\frac{3.9\times 10^{9}\,yr}{1.876\times 10^{9}\,yr} }$

$m\approx 37.521\,g$

The current amount of the Potassium-40 sample is approximately 37.521 grams.

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3 years ago

Technological methods used to prove that plate tectonics occur include:

kramer

I think the correct answer from the choices listed above is option D. Technological methods used to prove that plate tectonics occur include ocean floor mapping and earthquake tracking. Hope this answers the question. Have a nice day.

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3 years ago

Read 2 more answers