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k0ka [10]
3 years ago
5

the sahara desert switches from sand to jungle back to sand every 20,000 years. what is the cause for this change?

Geography
1 answer:
beks73 [17]3 years ago
6 0

Answer:

Every 20,000 years, the polarity of the earth changes.

Explanation:

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6 in.<br> 10 in.<br> 9 in.<br> A = [ ? ]in.?<br> 6 in.<br> 7 in.<br> 5 in.<br> Enter
Tanya [424]

Answer:

6=403.42

10= 220226.46

9= 8103.0

A= 1

6= 403.423

7= 1096.663

5= 148.41

Explanation:

to solve this use the maths knowledge.

4 0
3 years ago
Directions (51–65): Record your answers in the spaces provided in your answer booklet. Some questions
serious [3.7K]
After studying the data table above and based on the previous answers from 51 through 53, and my own knowledge of this subject, I can easily answer this questions. The chemical symbol for the element that was shown in the table, that will absorb the two wavelengths of light is Ca. 

The chemical Ca is also known as calcium. The atomic number is 20 for Ca. 
7 0
4 years ago
“Commercial production and sale of goods” is one definition for which term? factory capitalism economy industry
Simora [160]

Answer:

Hi Lovelys!!

Answer is down below!!

Explanation:

The Answer is C. Industry  

Economic activity concerned with the processing of raw materials and manufacture of goods in factories.

Hope this helps!! =3

Have a wonderful day, evening, or night!! <3

6 0
3 years ago
Which of the following is a possible factor that has prevented humans from making changes that would allow them to rely entirely
Kazeer [188]

Answer:

d) both B and C

Explanation:

Although it has been proven that non-renewable resources such as petroleum are indeed running out and are no infinite, many people believe that there are enough non-renewable resources left on the planet to not worry too much about investing all our resources in renewable energy. This reality will only change with a better education system.

It is also true that efficient technology does no always exist and that when it does can be quite expensive. A good example is the difficulty of storing excess solar or wind energy to be used when atmospheric conditions cause a drop in production.

6 0
4 years ago
Which of the following is evidence for supermassive black holes in active galaxies?
Viefleur [7K]

Answer:

A super massive black hole contains ,a million and a billion times more mass than a stellar black hole.

They occur on the galaxies.

Explanation:

An evident one by the astronomers was the  quasars,  which  radiate a million more times than the sun.

Evidence on the existance on  supermassive black holes  has beeen cited following the orbiting of the galaxy.

8 0
3 years ago
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