The Earth is about 4.6 billion years old.
Answer the following statement true (T) or false (F)
True
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Which one of the following reduces net GDP?
A) A coal-fired power plant that pollutes the air B) Manufacture of products to clean polluted water C) Clear-cutting and logging of 1,000 acres of pine trees D) Degradation of farm equipment
Biodiversity enhances human food security because it ________
A) decreases the number of predators B) is a potential source of new food items or new genetic varieties of existing foods C) increases the number of available pathogens D) means that there is genetic uniformity E) reduces the number of pollinators available to any one plant species
Freshwater passing through uplifted sediments containing quick clay changes the sea salt content leaving quick clay with all but which of the following?
A. water contents commonly in excess of 50 percent B. grains mostly less than 0.002-mm diameter C. a higher salt content D. weak structure
Subduction zones are downgoing convection cells in the earth but only carry oceanic material into the mantle
Indicate whether the statement is true or false