<span>Only eight elements—oxygen (O), silicon (Si), aluminum (Al), iron (Fe),calcium (Ca), sodium (Na), potassium (K), and magnesium (Mg)—constitute more than 99% of its volume. In the earth's crust, these elements generally form crystalline solid compounds of de finite chemical composition which are known as minerals. hope i helped</span>
The statement that describes plateau is that the plateaus are a surface that are sharp peaks with steep slopes on at least one side. So, the correct option is C.
Plateaus are a part of one of the major land forms of the Earth that are a form of rough and non-uniform surfaces formed due to formation of sedimentary rocks.
<h3>Plateaus </h3>
- Plateaus are formed due to the magma that is present inside the Earth which is applied through an effort to push through the surface of the Earth, but during this entire process they fail to enter and pass through the crust.
- Plateaus may also be made, which cause the volcanic eruptions in the Earth after the lava is busted. There are several types of plateaus that are formed in different regions due to conditions of such region.
- The four types of plateaus that are present on Earth's surface are Continental plateaus, Volcanic plateaus, Inter-montane plateaus and Piedmont plateaus.
- The continental plateaus are said to be formed to separate each continent from the other. So there are about 6 continental plateaus on Earth. Volcanic plateaus cause eruptions in the form of lava.
Hence, the correct option is C that the plateaus are formed as the sharp peaks with steep slopes on at least one side of such surface.
To know more about plateaus, click the link below.
brainly.com/question/24352276
B. Two (2)
1) Arab traders brought Islam to North Africa - Started in the 7th century.
2) European trading posts; slave trade - The transatlantic slave trade began in the 15th century.
3) Scramble for Africa - Was the period of occupation, division, and colonization of African territory by European powers, which happened between 1881 and 1914.
4) European colonies established by Berlin conference - The Berlin Conference of 1884–1885, also known as the Congo Conference or West Africa Conference regulated European colonization and trade in Africa, it was seen as the formalization of the Scramble for Africa that had started earlier in 1881.
5) African nations gained independence - There has been some controversies about the first African country to gain independence, Egypt was the first in 1922, however, it was not considered as an African nation at that time, or lets say, some Egyptians did not accept that they were Africans, having said that, we can say Africa started gaining independence from 1922-1990 to when Namibia finally gained independence from the white minority apartheid government of South Africa, however, if we are talking about independence from European colonization, it is the Seychelles which got her independence from France on June 27th, 1977.