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3 years ago

What kinds of evidence do Geographers use

2 answers:

6 0

Geographers use a variety of tools. Some included are: Artificats, Written records or books, maps, and GPS.
They also use surveying equipment with the "theodolite" being the most common and recongizable. This tool uses a level lens on a tripod that measures relative distance and elevation.
Geographers can also use remote imaging as photographic evidence. This allows geos to use remote images that record information beyond the visible spectrum such as magnetic activity, infrared temperature, and subterranean water levels.

Hope this helps! ( ͡ ͜ʖ ͡ )

Ber [7]3 years ago

3 0

Geographers use all the evidence that they collect like minerals or photographs

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Describe the political and economic challenges that have faced Eritrea since it gained independence.

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Answer:

Eritrea has faced several challenges since gaining independence from Ethiopia in 1993. The country has only one political party that maintains all of the control. Democratic national elections have yet to be held; the transitional government is still in power, and no constitution has been implemented. Furthermore, territorial disputes with Ethiopia continue. Eritrea's command economy is struggling. Over 80% of the population is engaged in subsistence agriculture. Climate changes have created problems for agriculture, and drought is a major issue. Finally, property damages due to war have proven costly.

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Option: clearing the land to raise crops.

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On your most recent mountain climbing adventure, you recorded a barometric pressure of 1000 mb at the base of a mountain. When y

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Answer:

B) 5000 meters

Explanation:

Barometric pressure depends on the height, as of course there is more air above an area as the air column is higher. Usually, it is defined as a exponential relation which comes as follows:

1. $P=P_{0}*e^{(\alpha*h) }$

Being:

P the pressure at the determined height. In our case, would be the 950 mb at the summit

$P_{0}$ the initial pressure. In our case, would be the 1000 mb at the base.

α a constant value, which is usually found on literature as $-1.19*10^{-5} m^{-1}$ . It depends on the air density and the estimations on how much air do we have above.

h is the height which we want to determine the pressure at

Of course, we need to clear the height on the previous equation, so we need to seek help on the natural logarythm. First of all, let's clear the exponential expression from 1 :

2. $\frac{P}{P_{0}}=e^{\alpha*h}$

After that, apply the natural logarythm at both sides of the equation 2:

3. $ln(\frac{P}{P_{0}})=ln(e^{\alpha *h})$

Computing 3:

4. $ln(\frac{P}{P_{0}})=\alpha*h$

And clearing h in 4:

5. $\frac{ln\frac{P}{P_{0}} }{\alpha } =h$

Replacing known values in 5. Please have in mind, when replacing, both of the pressure values need to be in the same unit (in this case, millibars)

$h=\frac{ln\frac{950 mb}{1000 mb} }{-1,19*10^{-5} m^{-1}}=4310,36 m$

As this is an estimate, we would say that mountain is approximately 5000 m. Quite far from the result, maybe the source has different α constant values.

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2 years ago