The correct answer is B. 50ft
Explanation
This image is a contour line in which each line represents a cut of the terrain at a specific height, you can see that the first line has a number zero, the third line has a number 100ft and the sixth line has a number 200ft. Therefore, it can be stated that each line represents an ascent of 50 ft in height because the interval corresponds to 50 ft in height. So, line 1, 0 ft; line 2, 50 ft; line 3, 100 ft; line 4, 150 ft; line 5, 200 ft; and so on. So the correct answer is B. 50ft.
Answer: Continental slope
The continental slope is said to be the steepest part of the continental margin, where there is a sudden decrease in slope or it suddenly descends down to the ocean floor and the sea floor begins to level out towards the abyssal plain. Moreover, this portion of the sea floor also marks the end of the continental margin called the continental rise.
Answer:
Pollutants are responsible for creating an imbalance of the substances that leads to a negative impact in a particular part of the earth like air, water, soil, noise, and more.
Primary pollutants are the pollutants that are directly generated from their sources such as activities by humans like air and water pollutants from the car, from ships, that affects the organs of humans like lungs, eyes, stomach and reduces our immune system and our life. Indirectly affect us. In the environment, they increase toxic substances in high amounts that cause various negative impacts.
Secondary pollutants form due to the reacting of primary pollutants and natural resources. Acid rain is an example of the secondary pollutant result which is formed due to dissolved sulphuric acid in rainwater. It also affects the skin of humans and affects the environment by increasing acidity to soil and water.
The answer is a)<span> Trade is a recent development in coastal countries.
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This is an incorrect statement as Trade in the coastal countries of Africa goes back more than a millennium.
During the European colonialism, these countries experienced huge trade growth due to the slave trade and exploitation of natural resources.
Most of these countries had major ports which were used as trading posts, stop-overs and major entry points of West Africa.
After the expansion of the Spanish Empire in South America, trade between the two continents flourished and as late as the 19th and 20th century, European powers were still exploiting natural resources in the region.
Today, the region is growing thanks to billions of dollars of investment from China.
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