What are some of the problems that need to be overcome before solar power can become a thoroughly mainstream form of energy production?
What will be an ideal response?
Firstly, solar power has to be cost effective. We will not switch to more environmentally friendly forms of energy unless renewable energy is cheaper. Secondly, because solar power is only available during the day, a backup form of energy is required for nighttime use. Finally, some areas of the world simply do not get enough consistent sunlight for solar power to be a viable option.
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In tropical rainforests, vegetation layers are structured according to
a. how deep the rainfall penetrates into the forest b. the plant's needs for sunlight c. how well each plant handles predation by herbivores d. nutrient availability and uptake by plant roots e. tropical rainforests are not layered
All of the following human activities will increase the sediment load in a river except
A) logging of forests on steep slopes. B) converting cropland to natural vegetation. C) surface mining for coal. D) large-scale construction projects.
At what temperature and pressure would kyanite, sillimanite, and andalusite form simultaneously?
A) 600°C and 2 kilobars B) 700°C and 1 kilobar C) 800°C and 6 kilobars D) 500°C and 4 kilobars
Heavy rains and steep slopes caused landslides and debris flows along the Venezuelan coast.
Answer the following statement true (T) or false (F)