What is the definition of planetary differentiation?
A) Separation of materials based on density
B) Categorization based on chemical formulas
C) Mixing of materials to produce a new compound
D) Divisions of planets based on constituent materials
Answer: A
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What is the source of acid rain?
A. All rain is acid rain because rain has a hydronium ion concentration greater than 10-7 M. B. All rain is acid rain because rain has a pH is less than 7. C. Rain is normally basic, but depending on the weather it can get slightly acidic. D. Acid rain is from dissolved carbon dioxide. E. none of the above
When the Sun crosses the celestial equator, and day and night are of equal length around the globe, it is the time of the ________
Fill in the blank(s) with correct word