Which of the following describes a solution that contains a buffer?
a. sodium hydroxide, a base, is added to the solution, and the ph of
the solution becomes higher.
b. distilled water is added to the solution, and the ph of the solution
does not change.
c. acetic acid is added to the solution, and the ph of the solution
becomes lower
d. citric acid is added to the solution, but the ph of the solution does
not change.
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Liquid water turns into water vapor at which step in the water cycle? a. precipitation o b. water run off c. evaporation d. condensation

Which locations on the map are low-pressure areas? a b c d e

20 point pls brianliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?