The impact of a large asteroid on Earth will NOT typically result in ____
a. acid rain
b. tsunami, if the impact occurred in the ocean
c. iridium anomaly
d. melted rock and tiny, hollow spherules
e. high radioactivity in the crater
ANSWER: e
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Weathering in tropical climates can produce residual ores rich in
A. feldspar and mica. B. iron and aluminum. C. sulfur and sulfide ores. D. calcite and quartz.
During an action potential, a neuron's membrane potential
A) increases until it reaches threshold, then spikes. B) decreases as sodium ions flow into the neuron. C) increases until it reaches threshold, then decreases. D) may or may not reach threshold.
Poorly sorted, nonstratified drift deposits are called _______. Fill in the blank(s) with the appropriate word(s)
Comets typically orbit the sun at the distance of Neptune
Indicate whether the statement is true or false