Judge the following sentence according to the criteria given below. Continental crust dominated by rocks older than 1 billion years but no ocean crust older than 180 million years exists because oceanic crust is created at mid-ocean ridges
A) The assertion is correct but the reason is incorrect.
B) The assertion is incorrect but the reason is correct.
C) The assertion and the reason are both correct, and the reason is valid.
D) The assertion and the reason are both correct, but the reason is invalid.
E) Both the assertion and the reason are incorrect.
Answer: D
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This Gigapan image shows a dark metamorphic rock in contact with a lighter igneous rock (granite). Review the statements below, and determine which are correct about the dark metamorphic rock on the left in the Gigapan image.
A.) The metamorphic rock has undergone high-grade metamorphism. B.) The metamorphic rock shows foliation. C.) The metamorphic rock shows no foliation. D.) The metamorphic rock has undergone low-grade metamorphism.
A highly biological productive ocean surface appears chalky; what plankton is likely successful here?
A) Diatoms B) Dinoflagellates C) Coccolithophores D) None of these choices
How was the radius of Earth determined? Is Earth a perfect sphere?
What will be an ideal response?
When light encounters a rough surface, the rays will strike the surface at ________ angle(s), which tends to ________ the light rays
A) one; limit B) one; scatter C) different; limit D) different; scatter