The PH of a solution is a measure of how acidic or basic a solution is.
I don't understand the question being answered can you clarify?
It should be noted that tropical cyclones simply mean low pressure systems which form over warm tropical waters.
<h3>What is tropical cyclone? </h3>
It should be noted that tropical cyclone simply means the intense circular storm which originates over warm tropical oceans.
Tropical cyclones usually form when the temperature of the sea surface is above 26.5°. It will dissipate when it moves over land.
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B. The Sahar desert. The people from the south east of the continent migrated to other parts of Africa but not north Africa because the Sahara was in their way. This led to the ottomans to easily lay claim to North Africa and develop a Islamic and Arabic like culture.
It would most likely be the last one. Erosion is effectively the process of natural forces breaking down rock or soil, which allows it to move from place to place with the aid of forces like wind or water. I would say the answer would be the first one, but it only says rock, while erosion can affect more than just rocks. Hope this helps.