What is cation exchange capacity?
What will be an ideal response?
A measure of the soil's ability to hold positively charged ions
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More than 2000 years ago, Hipparchus compared the positions of some stars with their positions recorded nearly two centuries previously and realized that:
A) the celestial poles and equator remained stationery. B) the celestial poles and equator were slowly moving across the sky. C) the stars were moving closer to each other. D) the stars were moving across the sky randomly.
What was the significance of the end of the era of nucleosynthesis, when the universe was about 5 minutes old?
A) The basic chemical composition of the universe had been determined. B) The proportions of dark matter and luminous matter had been determined. C) It marks the time at which the first stars formed. D) It marks the time at which the expansion of the universe had settled down to its current rate.
An object of mass m is attached to string of length L. When it is released from point A, the object oscillates between points A and B. Which statement about the system consisting of the pendulum and the Earth is correct?
A. The gravitational potential energy of the system is greatest at A and B. B. The kinetic energy of mass m is greatest at point O. C. The greatest rate of change of momentum occurs at A and B. D. All of the above are correct. E. Only (a) and (b) above are correct.
The high temperature of the corona is directly responsible for
A) prominences. B) flares. C) the solar wind. D) aurora. E) sunspots.