A student put an elodea plant in a test tube for 24 hours. For 12 hours, the plant received light; for the next 12 hours, the plant was kept in the dark.
The student measured the pH in both conditions. Explain why the water
became acidic at highttime. (You may use the formula for photosynthesis:
6CO, + 6H 0 -- CH, 20. + 602.)

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

What do nitrifying bacteria convert

Pl as time goes by and water goes through the water cycle again and again, the amount of water on earth: increases decreases ostays the same goes up and down