Scientists use proxy records in climate research to determine ________
A) climates hundreds and thousands of years ago
B) current levels of carbon dioxide
C) changes in the ozone layer over the past 30 years
D) changes in temperature over the past 100 years
A
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The Superfund Act was designed to make polluters pay for cleaning up hazardous waste, but taxpayers are now paying for their cleaning.
Answer the following statement true (T) or false (F)
Which of the following is NOT a way to change the porosity of a rock?
A. Cut the rock with fractures. B. Fill the pores with water. C. Deposit natural cement into pores. D. Compact clay and other sediment.
Natural selection will ultimately make a species
A. Physically bigger B. More intelligent C. Less vulnerable to its predators D. Better adapted to its environment E. More aggressive
Passive-solar heating systems are so named because they do not involve mechanical devices.
Answer the following statement true (T) or false (F)