We refer to this concept as "sea level". (answer D is the correct one)
Actually, the level of the sea is not constant and it's not the same everywhere, so we are talking here about the average sea level only.
Some places are located below the sea lever (for example some parts of the Netherlands) and they have to take extra measures not to be flooded.
For about six months there is no insolation on the north pole due to its position on the Earth and the Earth's position itself. When the Earth is in the December solstice, the earth is rotating around on a relatively higher plane. This phenomenon leads to the insolation of the north pole from approximately three months before and three months after the December solstice because it is too high far to receive the sun's rays.
The answer is upward expansion because weathering occurs when rocks are broken down into smaller pieces by physical or chemical processes
These creatures are completely adapted to survive at this deep in the sea.
They can attract prey using the glowing part of their heads, which emits a strong light (strong, considering that at this deep in the ocean there is close to 0 sunlight reaching the environment), and lure smaller fishes to the anglerfish. When the fish is hunting, he remains still as he waits for his prey to come.
The process of locating a mate is initiated by the female, who is usually much larger than the male. The female angler fish execrates chemical that attracts males, and once the male founds her, he will bite her skin and will slowly merge with her until they become one, providing semen when she is ready to procreate.
The term known as <u>sea floor spreading</u> causes Earth's tectonic plates to shift.