The two most abundant elements in the crust are
A. iron and aluminum.
B. oxygen and silicon.
C. sodium and calcium.
D. magnesium and potassium.
Answer: B
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Cells obtain energy from ATP
A. during cellular respiration. B. when the sodium-potassium pump moves potassium ions into cells. C. when one of ATP's phosphate groups is removed, leaving ADP. D. when ADP is converted to ATP.
How might you distinguish a sodium-vapor street lamp from a mercury-vapor street lamp?
A) use binoculars to look for printing adjacent to the bulb B) look at the street lamps through a spectroscope and match their spectral patterns to their respective atomic spectra C) ask your local utility company to identify these lamps for you D) The shadows cast from a sodium-vapor street lamp tend to be more diffuse around the edges.
Differentiate the three types of magma based on igneous composition and silica content
What will be an ideal response?
How has increased mobility changed the United States?