Which of the four sedimentary layers in this figure is the oldest?
A. the layer on bottom
B. the layers in the middle
C. the layer on top
D. There is not enough information to tell.
Answer: A
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Most failed species reintroduction occurs because of lack of ____________________
Fill in the blanks with correct word
Which conditions promote the growth of coral reefs?
A. clear water B. warm water C. shallow water D. All of these conditions promote the growth of coral reefs.
What it the main difference between an ionic and a covalent bond?
A. Both bonds are the same, but named different to describe different atoms involved. B. The electrons in both types of bonding undergo an exchange. C. One is the sharing of a pair of electrons, and the other is the transfer of at least one electron. D. The electrons are traded between the two atoms and this keeps the atoms close. E. One involves electrons, and the other does not involve any electrons.
The Kyoto Protocol is credited with closing the hole in the ozone layer
Indicate whether this statement is true or false.