If coal is composed of organic materials such as vegetation, what prevents them from decaying before they become a sedimentary rock?
What will be an ideal response?
Answer: Coal forms in swamps, which are oxygen-deficient. There is not enough oxygen to allow bacteria to completely decay the plant matter.
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Caves usually form in
A. topsoil. B. underground regions that contain little groundwater. C. subsoil. D. the saturated zone beneath the water table.
Why does weathering of granite bedrock produce rounded shapes?
A) The rounded shapes are pillows formed at depth in the granitic magma. B) Weathering removes corners and edges, as in spheroidal weathering. C) Burrowing animals eat away parts of the granite. D) Roots rub against the edges of the granite.
About 90% of the world's marine fish harvest takes place within
A) the international fishing waters. B) twelve miles of shore. C) coastal countries. D) the exclusive economic zone.
When a primary alcohol is oxidized to a carboxylic acid, an intermediate product is an aldehyde. Which physical property of the aldehyde can be exploited if it is desired to obtain the aldehyde as the reaction product?
A) boiling point B) molecular weight C) solubility D) any of these