How was the style of plate tectonics different in the Archean than it is today? When did the present
style of plate tectonics begin? What will be an ideal response?
Earth in the Archean was much hotter than it is today because Earth's radiogenic heat production was
much higher; in other words, many radiogenic isotopes have decayed to stable daughters and no longer
give off heat. With more heat available, seafloor spreading and plate movements took place more
rapidly. The current plate tectonics style began by the Paleoproterozoic.
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The electric current in common wires is made up of
A. ions. B. electrons. C. protons. D. all of the above
For each of the following unbalanced equations, which is depicted: oxidation or reduction?a) Cr ? Cr3+b) Sn ? Sn(OH)42-
A. a) reduction; b) oxidation B. a) oxidation; b) oxidation C. a) reduction; b) reduction D. a) oxidation; b) reduction
Compare and contrast the causes and effects of El Niño and La Niña.
What will be an ideal response?
Hypoxia, or low-oxygen conditions, is generally considered to occur when oxygen in the water drops to ________ ppm.
A. 10 B. 5 C. 2 D. 15 E. 0