Thunder
A) moves at the speed of light.
B) always appears to the listener as a sharp clap.
C) is the cause of heat lightning.
D) results from the explosive expansion of air.
Answer: D
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Solar energy is becoming more popular recently due to
A. the decline of nuclear power after Fukushima. B. the decreased abundance of natural gas in the United States. C. new technology and the lower cost due to subsidies and tax breaks. D. conflict in the Middle East over oil supplies. E. the rising temperature of the atmosphere.
The discharge of the following floods will be
(a) 5-year flood: __________ cms (b) 10-year flood: __________ cms
Why do some rocks consist of mineral grains with sharp edges and flat surfaces, while others consist of mineral grains with rounded edges and surfaces?
What will be an ideal response?
Sorted sediment deposited by glaciofluvial action are called
A) glacial erratics. B) stratified drift. C) till. D) moraines.