By volume, which of the following are the most abundant gases in the Earth's atmosphere?
A. nitrogen and oxygen
B. carbon dioxide and nitrogen
C. oxygen and water vapour
D. oxygen and helium
Answer: A
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Estuaries containing different mixtures of fresh and saltwater throughout most of their length are: a. salt wedge estuaries
b. well-mixed estuaries. c. partially-mixed estuaries d. reverse estuaries.
Subducting oceanic crust underneath oceanic crust will produce ________
A) hot-spot volcanic islands B) volcanic island arcs C) continental volcanic arcs D) mid-ocean ridge
A glycine solution is 2.50%(w/w). How much glycine is there in a sample which has a mass of 250. g?
A) 1.25 g B) 5.00 g C) 6.25 g D) 12.5 g
At the north pole, the sun rises on about March 22, and sets on about September 21, thus there are six months of light and six months of darkness
Indicate whether the statement is true or false