Answer: Overgrazing is the major cause of desertification worldwide. Other factors that cause desertification include urbanization, climate change, over drafting of groundwater, deforestation, natural disasters and tillage practices in agriculture that place soils more vulnerable to wind.
Explanation:
When performing self-myofascial
release of the hip adductors, the part of the body that focus should be on foam
rolling is the groin region inside the upper thigh. Self-myofascial release for
the adductor muscles is a great exercise to relax really tight and restricted
hip adductors.
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Answer: C. The sign of the enthalpy of the reaction reverses.
Explanation: Enthalpy of a reaction is the net heat absorbed or released during a chemical reaction.It is represented by 
. It is negative for exothermic reactions in which heat is released and is positive for endothermic reactions in which heat is absorbed.
When a chemical reaction is reversed the heat of the reaction changes its sign.
The decomposition of calcium carbonate is an endothermic reaction as heat is required to break the bonds and thus energy is absorbed.
When the reaction is reversed, the reaction becomes exothermic as now bonds are getting formed and energy is released.
Answer:
Salmon populations in the United States is declining due to the following factors:
1. Over-fishing and human activities have put a major influence on the population of salmon.
2. Due to industrialization, urban growth, unplanned farming, deforestation, and pollution would have imparted strains on the stocks of salmon. Apart from this chemical contamination from the industrial run-off and agricultural activities are also declining populations of salmon.
3. Genetically modified fish from hatcheries usually escape and interbreed with wild fish, thus, changing the genetic features of the populations.
4. Construction of hydropower dams is also a major cause of the salmon population declining.
