Answer:
The main mechanism that is behind the configuration of the present landscape and the formation of oceans is the plate tectonic movement, which is continuously taking place since the last 250 million years. This plate movement is going on due to the generation of large uprising current in the mantle, which is commonly known as the convection current. These currents are originated due to the heat radiated from the extreme interior of the earth.
Due to this motion of plates, there formed three different types tectonic boundaries such as the convergent, transform and divergent boundary. The high elevated mountains are formed adjacent to the convergent plate boundaries and the divergent plate boundaries are responsible for the formation of ocean bodies.
The continents are generally comprised of continental crust, which is comprised less denser minerals and rocks, and on the other hand, the oceans are comprised of oceanic crust which are made up of heavier minerals and rocks. It is because of this reason, the continents floats and it rises up during the collision of any two plates namely continent-continent, continent-ocean or oceanic-oceanic plate collision.
The false statement is -
a. Agricultural production has increased slightly since 1960.
The agricultural production in Africa, since 1960 until the present, has been increasing at a moderate rate, not at a small rate. If it was only a slight increase, considering the ever-growing population on the continent (it is the continent with fastest and biggest growth of population) than very big portion of the ''plus'' population would have died from starvation. The continent definitely needs bigger production, especially for its own needs, but it has to be said that little by little the situation is getting better at some regions.
This is Israel!
Israel produces a lot of food, very effectively, and also imports a great portion of it, and that despite having quite unfavorable conditions for agriculture.
They accomplish this through careful planning and through effective irrigation.
Explanation:
disavantage
many diseases are caused due to spread of mosquitoes, worms and insects on account of stationary water in canals.
advantage
economic development can be expedited by avoiding dangerous droughts. depending on rainfall can be minimized through canal development.
