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3 years ago

Which of the following is a way that minerals are used?

Geography

2 answers:

geniusboy [140]3 years ago

4 0

All of the above, or D

Bas_tet [7]3 years ago

3 0

All of the above are ways that minerals are used.
Your answer is all of the above, D.

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20 points!!! it's about China

Yanka [14]

China, capital Beijing
Languages only two Standard Mandarin and Mandarin Chinese
The religions are Taoism, Islam, and Confucianism
That is really I can an answer, I'm not too educated in China, sorry man. I wish you luck!

7 0

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.

4 0

3 years ago

100 POINTS PLEASE HELP ASAP!!!!!!

slega [8]

Answer:

The Quebec-City-Windsor Corridor

Explanation:

The population density of Canada is 4 people/km².

The most densely-populated urban areas are Vancouver and Montreal (4800/km²).

The most densely populated region of Canada (80/km²) is the Quebec-City-Windsor Corridor. It contains almost half the population of Canada.

There are two main reasons for this.

(a) Climate

The region is entirely below the 47th parallel, so the summers are warm, the winters are not harsh, and the area is suitable for agriculture.

(b) Location

The corridor is close to the border with the United States and carries the bulk of Canada's trade with them. It makes sense for people to live as close to the US border as possible.