What is the importance of cyanobacteria for our atmosphere? What did they produce and how? What happened to the first materials they produced?
What will be an ideal response?
Answer: Cyanobacteria were one of the earliest known life forms on Earth and were responsible for producing oxygen in the atmosphere through photosynthesis. The first oxygen products they produced were removed from the atmosphere by bonding with iron in the ocean, creating the banded iron formations. This process ended approximately 2.5 billion years ago with the Great Oxygenation Event.
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An extremely long ocean wave created by an underwater earthquake that may travel hundreds of kilometers per hour is a
A) rill. B) dune. C) moraine. D) tsunami.
Which of the following is a correct IUPAC name?
A) 1-isopropyl-1-cyclohexanol B) 1-isopropylcyclohexanol C) trans-1-isopropyl-1-cyclohexanol D) none of these
A cone of depression can form if
A. limestone caverns collapse. B. groundwater is overpumped from an aquifer. C. an artesian well goes dry.
Which of the following is not exogenic in nature?
(a) Weathering (b) Erosion (c) Mass wasting (d) Batholith formation