A rock contains 12.5% of its orignal K40 (half life = 704 million years). How old is the rock?
- About 1,400 million years old
- About 2,100 million years old
- About 2,800 million years old
- About 700 million years old
About 2,100 million years old
Environmental & Atmospheric Sciences
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In the figure below, two people are looking at the same point in the sky. Which of the following types of light does person A see?
A. unscattered light B. scattered light
Environmental & Atmospheric Sciences
In the western Pacific, the most powerful storms are called
A) typhoons. B) tropical anticyclones. C) hurricanes. D) monsoons. E) tropical depressions.
Environmental & Atmospheric Sciences
In which of the following areas would one likely find Aridisols?
A) northern Europe B) the selva in Brazil C) the U.S. southwest D) marine west coast climates
Environmental & Atmospheric Sciences
In what geologic period did lobe-finned fish adapt to terrestrial environments?
A) Cambrian B) Devonian C) Triassic D) Ordovician
Environmental & Atmospheric Sciences