Which statement describes a process involved in the evolution of earth’s early atmosphere? - cyanobacteria transformed carbon dioxide in the atmosphere into oxygen during photosynthesis. - heavier gases escaped through earth’s atmosphere, leaving only lighter gases such as oxygen behind. - volcanic eruptions produced enough oxygen to create earth’s atmosphere. - the amount of oxygen in the atmosphere declined due to respiration, or breathing.
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Chemistry, 21.06.2019 15:00
Which one of the following gases is not an important component of soil?
Answers: 2
Chemistry, 21.06.2019 15:10
Atank contains 240 liters of fluid in which 10 grams of salt is dissolved. brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 l/min; the well-mixed solution is pumped out at the same rate. find the number a(t) of grams of salt in the tank at time t.
Answers: 3
Chemistry, 22.06.2019 02:00
Which of the following is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents
Answers: 1
Chemistry, 22.06.2019 11:50
If oil spills continue, all of the following should be expected except (2 points) death of aquatic life. polluted groundwater. decreased soil productivity. increased global temperatures.
Answers: 3
Which statement describes a process involved in the evolution of earth’s early atmosphere? - cyanob...
Computers and Technology, 07.08.2019 22:10
Computers and Technology, 07.08.2019 22:10
Computers and Technology, 07.08.2019 22:10
Computers and Technology, 07.08.2019 22:10
Computers and Technology, 07.08.2019 22:10
Computers and Technology, 07.08.2019 22:10
Computers and Technology, 07.08.2019 22:10
Computers and Technology, 07.08.2019 22:10
Computers and Technology, 07.08.2019 22:10
Computers and Technology, 07.08.2019 22:10
Biology, 07.08.2019 22:10