Answer:
1- Option (D)
2- FALSE
Explanation:
The seafloor spreading takes place because of the divergent plate motion. Alfred Wegener observed this motion of the seafloor and the continents but was not able to explain the main mechanism behind this until the new theory came into the picture. The divergent motion of seafloor and the motion of the continents were explained by the universally accepted theory known as the Plate tectonic theory. This theory was able to explain the mechanism behind this plate motion.
The study of the seafloor spreading provided some pieces of evidence that supported the continental drift theory. They gave a basic idea about how the oceanic plate gets subducted (consumed) at the convergent plate motion that undergoes partial melting at greater depth. As a result of which the magma rises up to the surface on the overriding plates.
The crust represents the outermost layer of the earth. They are of 2 types, namely the oceanic and the continental crust. These crusts when slide past one another in a transform plate boundary, it is neither created nor destroyed. It remains conserved.
Thus, the correct answers are given above and the second statement is false.
The Earth's tilt is causing change of seasons on the latitudes north and south from 23 degrees, mostly being manifested in four different seasons.
Explanation:
The tilt of the Earth is a major factor that contributes to the occurrence of seasons in some parts of the planet. The tilt is roughly 23 degrees, and it half of the year it makes the Northern Hemisphere to be more exposed to the Sun, while in other half of the year it makes the Southern Hemisphere to be more exposed to the Sun. This results in changes of seasons throughout the year.
When the Northern Hemisphere is tilted toward the Sun, it experiences summer. During the summer, the North Pole experiences constant daylight because it is constantly exposed to sunlight. When the Northern Hemisphere is tilted away from the Sun, then it experiences winter, and the North Pole has constant night because it is to exposed to the Sun at all.
The transitional period between the winter and the summer is the spring, where the sunlight and temperatures gradually increase. The transitional period between the summer and the winter is the autumn, where the sunlight and temperatures gradually decrease. This is the same on the Southern Hemisphere as well, just in the opposite part of the year.
There are four stages that mark the seasons:
- spring equinox
- summer solstice
- autumn equinox
- winter solstice
Learn more about the summer solstice and autumn equinox brainly.com/question/3443691
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Answer:
True.
In pre-colonial Africa, some primitive versions of government systems were used.
Answer: A large body of water that is partially surrounded by land.
Explanation:
