Secure landfills are those that
A. Are sealed entirely with concrete
B. Have no groundwater below them
C. Accept no toxic substances
D. Are built like a bathtub with a lid
E. Are sealed entirely with durable plastic
Answer: D
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One gravity-driven mechanism for plate movement is _______________________, which is caused by the higher
elevation of ocean ridges in comparison to surrounding crust. What will be an ideal response?
Paleontologists estimate that ________
A) extinction is tied exclusively to human activities B) more than 99% of all species alive today have been discovered and described C) 99% of all species that have ever existed are now extinct D) biodiversity is evenly spread over the earth's biomes
Canada's population reached 30 million by the year 2000
Indicate whether the statement is true or false
Which of the following minerals would best be utilized for extracted iron to make steel?
A) hematite B) dolomite C) quartz D) talc