The composition of the Earth's inner core is thought to be ________.
Fill in the blank(s) with the appropriate word(s).
Solid iron-nickel alloy
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Which of the following statements characterizes oxygen 16 and oxygen 18?
A. Oxygen 16 and oxygen 18 evaporate from ocean water at the same rate. B. Oxygen 18 contains two more electrons than oxygen 16. C. Oxygen 16 and oxygen 18 exist in the shells of marine organisms. D. Oxygen 16 and oxygen 18 occur in roughly equal amounts in ocean water.
Disregarding air drag, how fast must you toss a ball straight upward in order for the ball to remain in the air for a total time of 2 s?
A) 5 m/s B) 7.5 m/s C) 10 m/s D) 15 m/s E) 20 m/s
In many megacities of the developing world, rapid urbanization has produced
A) policies promoting smart growth with public transit systems. B) millions of city-dwellers living on rented property in huge shantytowns and appalling conditions. C) a counter trend of fleeing the cities for rural areas. D) increased life expectancy and better public health than was available in rural areas.
What are the main things that plant roots must obtain from the soil? Name and describe a process (natural or unnatural) that can keep plants from obtaining the amounts of each of these things they need for survival
What will be an ideal response?