The answer is B. Russia's fertile soil is extremely depleted from constant use.
Since there isn't suggested answers I'll answer you which are not found.
In mid latitude regions of the Earth the climate types that are lacking are the tropical climate types, and the polar climate types. The tropical climate types are concentrated around the Equator and in lower latitudes, while the polar climate types are concentrated around the poles and higher latitudes.
The correct answer is The rotation of the Earth
Explanation:
Besides orbiting around the Sun which leads to seasons, Earth is all the time rotation on its axis, this movement occurs eastward and the movement is completed every 24 hours, due to this, a day is considered to last 24 hours. Besides this, due to the rotation of Earth different zones or areas in the planet are directly exposed to the sunlight during different periods, which leads to daytime and nighttime, considering daytime as the period in which a zone is illuminated by the Sun while in the nighttime the zone remains in the dark. Additionally, this phenomenon also explains why daytime and nighttime do not occur at the same time on all Earth. Thus, it is the rotation of the Earth the one that causes Earth to experience daytime and nighttime.
<span>When the floods went down the nile left thick rich mud which was excellent soil to plant seeds in after it had been ploughed</span>
For example, ocean currents (hydrosphere) affect air temperature (atmosphere): The Gulf Stream is a powerful water current in the Atlantic Ocean. It’s warm water moderates the temperatures on the east coast of the USA.
Another example of how the spheres affect each other is through erosion. Erosion happens in the desert when wind (atmosphere) shapes the sand in the geosphere. Water (hydrosphere) can also shape land, such as in the formation of the Grand Canyon.
