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3 years ago

What factors can contribute to the process of desertification?

Geography

2 answers:

babymother [125]3 years ago

8 0

- overgrazing

- over-cultivation

- fuel-wood clearing

- water extraction and unsustainable irrigation practices

- natural disasters

- climate change

Norma-Jean [14]3 years ago

7 0

<u>Answer</u>:

The factors that contribute to the process of desertification are:

1. Overgrazing

2. Unsustainable agriculture techniques

3. Deforestation

4. Unsustainable water management

5. Increase in population and excess use of natural resources

6. Urbanization and development of tourism

7. Famine, poverty and political instability

8. Climate change

<u>Explanation</u>:

Desertification means lands used for farming are becoming useless for farming and becoming like desert lands.

This desertification may cause due to the changes in climate like low rainfall in those areas.

This may also occur due to the removing of trees in forests that lead to a decrease in rainfall.

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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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