Earth systems resist change but there are times when the system can change abruptly or become unstable. This is known as a _______.
a. human mistake
b. negative feedback loop
c. equilibrium condition
d. tipping point
e. quantam moment
d. tipping point
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Why were nations and companies been able to work together to solve the global problem of ozone depletion?
What will be an ideal response?
Which of the following phase changes does not involve a liquid?
A) evaporation B) melting C) sublimation D) None, they all involve a liquid.
The tropical savanna climate has
A) the polar front all year-round. B) the polar front in winter and the subtropical high in summer. C) the ITCZ all year-round. D) the ITCZ in summer and the subtropical high in winter. E) the subtropical high in the summer and ITCZ in the winter.
__________ in the African Transition Zone continues, as natural conditions and human activity place pressure on the region through overgrazing and the lack of precipitation.
Fill in the blank(s) with the appropriate word(s).