Plates at our planet's surface move because of the intense heat in the Earth's core that causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell that forms when warm material rises, cools, and eventually sink down. As the cooled material sinks down, it is warmed and rises again
Answer:
Explanation:
Wind, solar and hydroelectric systems generate electricity with no associated air pollution emissions. Geothermal and biomass systems emit some air pollutants, through total air emissions are generally much lower than those of coal and natural gas fired power plants.
Answer:
The correct answer is option d: all of the above.
Explanation:
Having a teachers licences is a very honorable thing. Colleges and universities do not issue teacher licenses. Specific institutes built for this purpose issue licencees to teachers. The requirement for these license vary from state to state. The possession of a teacher's license gives the holder the legal right to teach.
Therefore all the options given in the question are true about teacher license.
Answer:
a. expected retaliation from competitors.b. the cost of substitute products.c. variable costs of production.d. customers' high switching costs.