Generally the top portion of the mantle and sometimes the lower crust
Rising global temperatures have a broad effect on the ocean because as the ocean warms it can hold less carbon dioxide, so more CO2 is released into the atmosphere, where it is a greenhouse gas continuing to facilitate the same process the answer is (B).
Soil erosion and the intensive use of fertilizers and pesticides might also present health risks to urban populations, as well as cause environmental harm. Furthermore, both large- and small-scale food production is associated with deforestation, draining of water reservoirs, etc.
C. Sahara
The Sahara Desert is the largest desert in the world, located in northern Africa.