1. Why was there liquid water on early Earth (4 billion years ago) even though t
ID: 290307 • Letter: 1
Question
1.
Why was there liquid water on early Earth (4 billion years ago) even though the sun was 30% less luminous than it is today?
Early Earth had more greenhouse gases in the atmosphere than today.
Early Earth had a lower albedo compared to today.
Early Earth had less nitrogen in the atmosphere when compared to today.
Early Earth had more geothermal energy and volcanoes compared to today.
2.
How can we tell that the currently increased carbon dioxide in the atmosphere is due to burning fossil fuels?
13C/12C ratios (?13C) in the atmosphere are increasing because fossil fuel comes from old plant material
13C/12C ratios (?13C) in the atmosphere are increasing because fossil fuel has a high 13C content
13C/12C ratios (?13C) in the atmosphere are decreasing because fossil fuel is old plant material
none of the aboive
3.
Since 50 million years ago, Earth has been generally
cooling, due to plate tectonics and decreased volcanism
warming, due to plate tectonics and decreased volcanism
cooling, due to increasing solar radiation
warming, due to increasing solar radiation
What does the figure above, showing planktonic ?18O from a marine sediment core, tell us about the climate changes going on around 55 million years ago (in the period marked by the red bar)? While not shown, assume that benthic ?18O from a marine sediment core shows no change during the period marked by the red bars.
Ice volume decreased
Ice volume increased
The temperature decreased
The temperature stayed the same
The temperature increased
What do the measurements of ?13C from a marine sediment core shown above tell us about what caused the PETA (Paleocene-Eocene Thermal Anomaly) shortly after 55 million years ago?
There was an increase in ?13C, suggesting the injection of plant-based carbon into the atmosphere (e.g., from fossil fuels)
There was an increase in ?13C, suggesting there were was less 12C carbon in the atmosphere/ocean due to reduced biological activity.
A large meteorite impact changed the atmospheric CO2 composition
A large cooling of the atmosphere/ocean system occurred
There was a decrease in ?13C, suggesting the injection of plant-based carbon into the atmosphere (e.g., from fossil fuels)
AEarly Earth had more greenhouse gases in the atmosphere than today.
BEarly Earth had a lower albedo compared to today.
CEarly Earth had less nitrogen in the atmosphere when compared to today.
DEarly Earth had more geothermal energy and volcanoes compared to today.
4 5 4 5 5 5 .5 0 2 (9%) 08,9Explanation / Answer
ANSWER- NO-1
Early earth had a lower albedo compared to today because of this sun light can not penetrate whole atmosphere and not reached at the surface of the earth.There are nimber gases present in atmosphere that originated from the volcanic activity.
ANSWER NO-2
In the atmosphere the co2 concentartion getting increased because the ratio of c13/c12 are incresed and their content is so high in older plants because normally the fossil fuel comes from the permo-carboniferous age of plant ,so at that time the mostly forest plant was on earth and get converted into the coal and buried into the strata.
ANSWER NO-3-
Since 50 million year the earth has generally increased their solar insolation and feel more heat on the earth but it can be one parameter.If we look at the solar insolation processing then we get some gases like the H2O vapour,co2 and other GREEN HOUSE GASES that intrap the heat in lower atmosphere during the terristrial radiation.
ANSWER NO-4.
On the basis of delta18o in figure above the question no.4 says that at the 55ma age abobe bar shown the value of o18 is some how decrease means around -1 so it helps the find out the exact reason.So the reason is derease of ice volume and incraes lots of temperature on the earth.
ANSWER NO-5
After 55 ma boundary of PETA THE DELC13 ALUE GETTING GRADUALLY INCREASE in to the atmosphere due the injection of plant based carbon or fossil fuel into the atmosphere.
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