Economic ________ occurs when a mineral reserve costs more to mine than what it can be sold for.
Fill in the blank(s) with the appropriate word(s).
depletion
You might also like to view...
Matching
a. interspecific competition d. mutualism b. Predation e. commensalism c. Parasitism f. mimicry 6. A tiny fish called a wrasse lives in and around the mouth of sharks. It cleans up the debris left after the shark eats flesh, and it gains protection by living in the shark's mouth. 7. Epiphytes are plants that live on the branches or trunks of trees in the tropics. The epiphyte gains access to water and sunlight, but does not hurt or help the tree. 8. Fleas live in and on household pets. 9. A kestrel (small hawk) and red-tailed hawk hunt for rodents in the same grassy meadow. 10. Your housecat kills the mice in your yard and around your house. 11. The Owl Butterfly is native to Costa Rica. Its hindwings have patterns in the shape and size of the eyes of a large owl. 12. Clownfish live amongst the stinging tentacles of sea anemone. They keep the sea anemone tentacles clean by eating the debris, and they gain protection from other animals by living in the tentacles. 13. Sea lampreys attach themselves to fish such as trout.
Before sedimentary rock can be formed, sediment must be produced (weathered from preexisting rocks), transported, deposited, and ________
A) eroded B) melted C) lithified D) dissolved
The Maunder Minimum
A) occurred during the Little Ice Age. B) saw high levels of sunspots. C) is a consequence of the weak Sun paradox. D) caused a significant change in the eccentricity of Earth's orbit. E) has been deduced by examining ice-core samples from Greenland.
Which of the following is not an isomer of ethyl acetate?
A) methyl propanoate B) propyl formate C) butanoic acid D) None, they are all isomers of ethyl acetate.