This photograph shows an upper unit with fragments and a lower unit with tilted layers. Which of the following statements is true?
A. The lower unit is older because it was tilted and eroded before deposition of the upper unit.
B. The upper unit is younger because it contains pieces of the underlying unit.
C. The upper unit is younger because it is on top.
D. All of these choices are correct.
Answer: D
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What would the concentration of OH- be if the concentration of H3O+ was 1 × 10-5M?[H3O+] × [OH-] = Kw = 1 × 10-14
A. 1 × 105 B. 1 × 10-5 C. 1 × 10-14 D. 1 × 10-9 E. 1 × 109
What makes this collection of organisms a “community”?
1.Each organism interacts with every other organism present.
2.It is comprised of individuals from many different species.
3.There are no primary producers present.
4.The organisms present can all survive periods of low tide.
The upper mantle and the crust of Earth together constitute the ____________________
Fill in the blank(s) with correct word
From an historical perspective, which one of the following causes the greatest alteration in people's lifestyle?
A. prefabricated housing B. electric appliances C. television D. automobile