A jet stream usually stays too far north to affect Florida’s weather. What is the jet stream?
A- a spinning of the air in the same direction as earths rotation
B-the spinning of the air in the opposite direction of earths rotation
C- the movement of air from an area of high pressure to an area of low pressure
D- a narrow band of strong winds that blows in the upper region of the atmosphere

Water (2510 g ) is heated until it just begins to boil. if the water absorbs 5.09×105 j of heat in the process, what was the initial temperature of the water?

Fossil fuels are organic compounds that are made from

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.