Explain how extensive black shales such as those seen in the Middle Devonian across the United States might form


The essential features required to produce extensive black shales include undisturbed anaerobic bottom water, a reduced supply of coarser detrital sediment, and high organic productivity in the overlying oxygenated waters. High productivity in the surface waters leads to a shower of organic material, which decomposes on the undisturbed seafloor and depletes the dissolved oxygen at the sediment–water interface.

Environmental & Atmospheric Sciences

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The population of Pakistan is primarily

A) Hindu B) Jain C) Sikh D) Muslim E) Christian

Environmental & Atmospheric Sciences

The waters of the Earth system constitute the:

a. atmosphere.
b. lithosphere.
c. hydrosphere.
d. biosphere.

Environmental & Atmospheric Sciences

________ refers to the greater range between maximum and minimum temperatures that occurs in inland areas distant from large bodies of water

A) The maritime effect B) Specific heat C) Heat dome D) Continentality

Environmental & Atmospheric Sciences

Which drainage pattern is controlled by rock structures of variable resistance and folded strata?

a. radial b. trellis c. dendritic d. deranged

Environmental & Atmospheric Sciences