What are halite and gypsum considered?
a) Manganese nodules formed from precipitation out of the saturated water column
b) Metal sulfides associated with hydrothermal vents
c) Evaporite minerals formed from restricted open ocean circulation with high evaporation rates
d) Carbonate deposits in tropical seas
C
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Economic leakage results from
A. the flow of profits from tourist facilities to foreign owners B. underground water channels C. poorly repaired irrigation ditches D. bad plumbing
Permanent polyculture is an approach to sustainable agriculture where farms
A) are community-supported enterprises. B) grow a single crop on large parcels of land. C) and the crops grown on them are modeled on natural ecosystems. D) use genetically modified super predator species to control pests.
Lava is magma that has made it to the surface of the Earth
Indicate whether the statement is true or false
What region borders the Sahara Desert, has highly variable rainfall and a human population dependent on pastoralism?
A) West Africa B) East Africa C) Horn of Africa D) Central Africa E) Sahel