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The approximate age of the universe is estimated to be
13.8 billion years
shifts in ocean currents
no longer frozen with a gentle slope
large geographic area and in a short geologic time
placoderm fish
condensation and precipitation
cyanobacteria in Earth’s oceans
an impact event occurring on Earth’s surface
In the spring, when snow cover on the land melts, the water will most likely infiltrate Earth’s surface where that land surface is
13.8 billion years
shifts in ocean currents
no longer frozen with a gentle slope
large geographic area and in a short geologic time
placoderm fish
condensation and precipitation
cyanobacteria in Earth’s oceans
an impact event occurring on Earth’s surface
Which life-form existed on Earth for the shortest period of time?
13.8 billion years
shifts in ocean currents
no longer frozen with a gentle slope
large geographic area and in a short geologic time
placoderm fish
condensation and precipitation
cyanobacteria in Earth’s oceans
an impact event occurring on Earth’s surface
1 Water is returned from Earth’s surface to the atmosphere by
13.8 billion years
shifts in ocean currents
no longer frozen with a gentle slope
large geographic area and in a short geologic time
placoderm fish
condensation and precipitation
cyanobacteria in Earth’s oceans
an impact event occurring on Earth’s surface
Oxygen in Earth’s early atmosphere was first produced during the Precambrian from
13.8 billion years
shifts in ocean currents
no longer frozen with a gentle slope
large geographic area and in a short geologic time
placoderm fish
condensation and precipitation
cyanobacteria in Earth’s oceans
an impact event occurring on Earth’s surface
The mass extinction of the dinosaurs, approximately 65.5 million years ago, is inferred by most scientists to have been caused by
13.8 billion years
shifts in ocean currents
no longer frozen with a gentle slope
large geographic area and in a short geologic time
placoderm fish
condensation and precipitation
cyanobacteria in Earth’s oceans
an impact event occurring on Earth’s surface
During the late Silurian epoch, very salty seas extended from New York State to Michigan. These environmental conditions resulted in the formation of halite layers. At the same time, Eurypterus remipes lived in nearby environments. Both the halite la
13.8 billion years
shifts in ocean currents
no longer frozen with a gentle slope
large geographic area and in a short geologic time
placoderm fish
condensation and precipitation
cyanobacteria in Earth’s oceans
an impact event occurring on Earth’s surface
The major cause of monsoon rains in India and southeast Asia is seasonal
13.8 billion years
shifts in ocean currents
no longer frozen with a gentle slope
large geographic area and in a short geologic time
placoderm fish
condensation and precipitation
cyanobacteria in Earth’s oceans
an impact event occurring on Earth’s surface
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