If the outer core is cooler than the inner core, why is it in a liquid state?
A) It has more radioactivity than in the inner core.
B) It is under less pressure than the inner core.
C) It has greater water content than the inner core.
D) It has higher density materials than the inner core.
Answer: B
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A keystone species is a species whose presence
A. Provides food for all other species in a community B. Influences the population size of many other species in its community C. Is always at the top of the trophic levels as a top predator D. Is the main reason a community exists E. Is an indicator of environmental health
At the end of 2 seconds, a skydiver freely falling from rest has a speed of
A. 1 m/s. B. 10 m/s. C. 5 m/s. D. more than 10 m/s.
Structures on a beach affect the location and formation of sand dunes
a. True b. False
Knowing that the fastest growing source of electricity in the world currently is wind power, what is the main environmental advantage and environmental concern to be considered by any community considering wind power's future for their area?
What will be an ideal response?