For the following balanced reaction, which of the following is a gas? 2 Na(l) + Cl2(g) ? 2 NaCl(s)
A) Na
B) 2 Na
C) Cl2
D) Cl
E) NaCl
C
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Which of the following occurs when the Sun, Moon, and Earth are in alignment (i.e., in opposition or conjunction)?
A) Neap tides B) A lower tidal range C) Ebb tides D) Maximum tidal ranges
Which of the following are considered climate feedback mechanisms?
A. greenhouse gases and reflection/adsorption of sunlight B. ocean tides and ocean circulation C. greenhouse gases and short-wavelength radiation D. short-wavelength radiation and ocean circulation E. short-wavelength radiation and reflection/adsorption of sunlight
Some time in Earth's past, carbon dioxide was an abundant gas in the atmosphere. The primary reason for its subsequent decline was:
The "master gland" that produces many hormones that control the function of other endocrine organs is the
A) hypothalamus. B) anterior pituitary. C) thyroid gland. D) pancreas.