What is a moment magnitude based on?
A. Amount of energy released
B. Amount of ground shaking
C. Changes in the chemical composition of rocks
D. Human observations
Answer: A
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A dense canopy of trees, little leaf litter, and poor soil characterize
A. coniferous forests. B. tropical forests. C. temperate forests. D. chaparral.
When an atom becomes positively charged, it is called a(n) ____
a. electron b. neutron c. ion d. isotope e. positron
When do black smokers occur?
A) during plate tectonics movement B) during underwater volcanic reactions C) components dissolve below the seafloor, but then precipitate when they contact cold water D) components squeezed from beneath the sea floor dissolve upon contact of cold water
What is the average global sea-surface temperature?
a. ~5o C b. ~10o C c. ~17o C d. ~22o C