According to the geological time span, the era which covers major history of the Earth is considered to be Precambrian era.
Answer: Option 3
<u>Explanation:</u>
Precambrian era is considered to be the most covering history of the Earth based on two factors, one is that it is longest era according to the geological time scale.
And as it is the longest era, major historical events of Earth are witnessed during this time. Precambrian era is known to be the beginning of formation of Earth which was about 4.5 billion years ago and it lasted for 542 million years ago.
Answer:
Oxygen
Explanation:
The earth has been divided into three major categories crust, mantle, and core which are further segregated into sub-parts. Since the crust is the outermost layer of the shell, the outer crust of the earth consists of a combination of silicon and oxygen in the majority followed by some percentage of other metals as well. <u>The percentage of Oxygen includes nearly 50% i.e. 46.6% followed by 27.7% of Silicon and the other 25.3 % includes aluminum, iron, sodium, magnesium, etc</u>. Thus, '<u>oxygen</u>' is the correct answer.
Answer:
B. establish communes and promote labor-intensive agriculture
Answer:
Option D ( Australia and the Pacific Islands)
Explanation:
The tropical wet and dry climate can be found in Australia and the Pacific Islands.
The weather in these countries is dominated by the tropical wet and dry climate.Australia and the Pacific Islands has two seasons, wet season and dry season which are separated by transition periods, the wet season is characterize with big amount of precipitation, while dry season has along period of dryness. This sort of climate are sometimes called “savanna” climates
Answer:
climate elements are those which climate contain
and climate factor is those on whom climate depend upon