Why is the carbon-14 dating not accurate for estimating the age of materials more than 50,000 years old?
A. The concentration of carbon-14 in a body after 50,000 years is too low.
B. Living organisms are too decomposed after 50,000 years.
C. This form of radioactive dating is only accurate back 1,400 years.
D. Actually, carbon-14 dating is accurate back to around 5 million years ago.
Answer: A
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A) Earth B) Mars C) Moon D) Jupiter
Tropical forests are not well-suited for intensive agriculture because
A) the excessive amount of rainfall in the region tends to prohibit effective plant growth. B) available nutrients are stored in tropical forest vegetation, so when the ground cover and trees are removed, the nutrients are removed, too. C) the ground layer of vegetation in tropical forests is so thick that the land is extremely difficult to clear. D) the temperatures in tropical forests are too high to allow feasible crop production. E) they tend to be located too far inland.
The process by which several researchers review another researcher's manuscript prior to publication to ensure research quality is referred to as ________
A) investigative inquiry B) hypothesis testing C) critical analysis D) peer review E) quality control
Cars use ________ to reduce nitrogen oxide emissions.
A. Electrostatic precipitators B. Afterburners C. Catalytic converters D. Bag filters E. Fluidized bed combustion