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3 years ago

Explain global warming

2 answers:

7 0

Hi!gobal warming is the long-tearm heating of Earth's climate system observed since the pre-industrial period(between 1850 and 1900)due to human activities.

sweet-ann [11.9K]3 years ago

6 0

Answer:

Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere

Explanation:

hope this helps ;)

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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

1) Define the term developed nation.

Komok [63]

Answer:

A nation that typically has higher average income, slow population growth, and many different types of economic activity

Explanation:

This is because a developed nation would be a nation that has been founded for more than 300 years (I think). They would have more population and economic activity due to the fact that it has been founded for a very long time. Meaning that growth and economic activity have been going on for centuries.

6 0

2 years ago

17) What is a jet stream?

antoniya [11.8K]

A jet stream is a narrow variable band of very strong predominantly westerly air currents encircling the globe several miles above the earth.

5 0

4 years ago

What is one form nitrogen can take when it is in the biosphere?

NeTakaya

Answer:

Ammonification

Explanation: