Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
17 Cards in this Set
- Front
- Back
|
Earth's first atmosphere formed 4.6-4.0 Ga was composed of: |
Carbon dioxide, water, and nitrogen |
|
|
Great oxidation event |
Small but significant amounts of oxygen began to accumulate in the atmosphere. 2.4 - 1.8 Ga |
|
|
The oxygen for the great oxidation event came from photosynthesizing ____? |
Cyanobacteria |
|
|
Before it could build up in the atmosphere, oxygen oxidized iron in oceans to form _____? |
Banded iron formations (BIF) |
|
|
What percent of our iron comes from banded iron formations? |
90% |
|
|
Atmosphere |
The envelope of gasses, along with tiny, suspended solid and liquid particles, that encircles the solid earth. |
|
|
4 most abundant gasses in the modern atmosphere. |
Nitrogen-N² 78% Oxygen- O² 21% Argon. .9% Carbon Dioxide- CO² .04% |
|
|
At sea level, atmospheric pressure (barometric) pressure is equal to .... |
1 bar |
|
|
Troposphere |
The lowest level of atmosphere. This is where weather originates. |
|
|
Stratosphere |
Extends from the tropopause at about 17km to an altitude of about 50 km |
|
|
What is the earth's Aurora? |
A luminous phenomena. |
|
|
The earth's Aurora originate high in the atmosphere in the ____ ? |
Thermosphere/ exosphere |
|
|
5 air pollutants |
-Carbon monoxide -Sulfur dioxide -Volatile organic compounds (VOC) -Nitrogen oxides -Particulate matter |
|
|
How does acid rain form? |
Sulfur dioxide and nitrogen oxides in atmosphere react with water... |
|
|
Smog |
1. A brownish haze formed by automobile exhaust. 2. Ozone reacts with automobile exhaust. |
|
|
Ozone |
O³ forms in stratosphere by UV rearrangement of plain O² |
|
|
Ozone hole |
Springtime decrease in stratospheric... in Antarctica |
