Which of the following is produced in the Earth's upper atmosphere as a result of excited atoms and molecules giving off visible light?
A. prominences
B. flares
C. solar wind
D. aurora
Answer: D
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Because the same shore may be made of different rock types, shorelines ________; because waves refract, the shoreline ________
a. become irregular; straighten b. straighten; become irregular c. become irregular; become irregular d. straighten; straighten
The secondary rainbow is located outside the primary bow
Indicate whether the statement is true or false
We can use X-rays to determine the internal structure of a mineral, and thereby ________.
A. change the mineral's structure. B. shrink the mineral. C. destroy the mineral. D. identify the mineral. E. change the mineral's composition.
The size of a species' population, be that of an animal or plant, is influenced by births, deaths, immigration, and emigration.
Answer the following statement true (T) or false (F)