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Nataly [62]
3 years ago
7

Which process do scientists think provided Earth with an oxygen-rich atmosphere?

Geography
2 answers:
zaharov [31]3 years ago
8 0

Answer:

photosynthesis

So how did Earth end up with an atmosphere made up of roughly 21 percent of the stuff? The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen.

Explanation:

MrMuchimi3 years ago
4 0

Answer:

photosynthesis

Explanation:

Photosynthesis: Is the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.

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What conclusion can be drawn about the water supply in the Middle East?
klemol [59]
<span>Water is scarce because there are few lakes and rivers and many mountain ranges block rain from moving inland.</span>
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3 years ago
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
Continents differ in appearance from ocean basins because:______.
Lunna [17]

Answer:

b. each has its own geologic history.

Explanation:

An ocean is a body of salt water which covers approximately 70% of the Earth's surface. About 97% of the Earth's water is comprised of ocean and as such it is the most prominent and defined feature of the Earth. There are basically four (4) categories of an oceanic basin and these are;

<em>1. The Pacific ocean. </em>

<em>2. The Artic ocean. </em>

<em>3. The Atlantic ocean. </em>

<em>4. The Indian ocean. </em>

On the other hand, Continents can be defined as very large landmasses or area of land typically surrounded and separated by water. It is divided into seven (7) main categories and these are;

<em>1. Africa. </em>

<em>2. Asia. </em>

<em>3. Antarctica. </em>

<em>4. South America. </em>

<em>5. North America. </em>

<em>6. Australia. </em>

<em>7. Europe. </em>

Continents differ in appearance from ocean basins because each has its own geologic history. Thus, a continent is less denser and comprise of a thick granite material while an oceanic basin is dense and an older basalt.

When a continent is compared with an oceanic crust, it was discovered that the continental crust is lighter in colour than the oceanic crust.

3 0
3 years ago
4. What evidence is there to suggest that tectonic plates move?
ExtremeBDS [4]
I would say earthquakes.
4 0
3 years ago
Read 2 more answers
Which country in central america is also an isthmus?
alexandr402 [8]

Answer: Central America is the southernmost region of North America. It is comprised of 7 countries: Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, and Panama. What type of landform is Central America? Central America An isthmus is a narrow strip of land, surrounded by a sea, which connects two larger landmasses.

Explanation:

3 0
3 years ago
Read 2 more answers
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