When the _______________ collapsed in 1991, the bordering countries declared independence and began the process of integration into the European community.
-Common Market
-German Empire
-Soviet Union
-Berlin Wall
-euro
-Soviet Union
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Helium, He, is a nonmetallic gas and the second element in the periodic table. Rather than being placed adjacent to hydrogen, H, however, helium is placed on the far right of the table because
A. helium is most similar to other group 18 elements. B. hydrogen and helium repel one another. C. the sizes of their atoms are vastly different. D. they come from different sources.
Methane is one of the "greenhouse gases." ________ is (are) a primary source of release of methane into the atmosphere.
Gas bladders help seaweeds: a. hold tight to the seafloor
b. keep their upper portions near the surface. c. photosynthesize nutrients. d. reproduce.
Crude oil is ________
A) formed less than 100 yards below the surface; in deeper places with more pressure, coal is formed B) refined to separate the chemicals used for gasoline, lubricants, plastics, and other products C) formed in a wide range of temperature and pressure circumstances D) composed of three different hydrocarbon molecules E) usable in its raw form