Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

Username is available taken
show password

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't Know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how


Test 1 Part 5

1. Atmosphere 2. Hydrosphere 3. Lithosphere 4. Biosphere 4 Chemical Reserves on Earth
Carbon • 4th most abundant element in the universe • Found in all organic molecules (amino acids, proteins, carbs, DNA)
100x • Before life on earth- CO2 levels were ____ greater than today • As plants evolved, CO2 was removed from the atmosphere through photosynthesis
Photosynthesis removes carbon from the atmosphere and places it into the lithosphere and biosphere
Cellular Respiration primary mechanism that returns C to the atmosphere or hydrosphere
Energy chemical energy in the form of ATP- _____ currency of living cells • Mostly enters the atmosphere as CO2 or methane (CH4)
o Burning organic compounds o Diffusion into the atmosphere (from the hydrosphere) o Decomposition Carbon enters through respiration and through:
Carbonates (limestone, marble) Carbon enters the lithosphere through:
o Carbonate (CO3-3) o Bicarbonate (HCO3-) o Organic, from algae/phytoplankton Carbon enters hydrosphere as CO2 which can be converted into:
CH4- methane is a potent greenhouse gas: o Occurs naturally o 21x more powerful than CO2
1. Wetlands 2. Lakes 3. Termite 4. Ocean 5. CH4 Hydrate • All products of fermentation (cellular respiration w/o oxygen being present) 5 Natural Sources of Methane...
1. Fossil Fuel Mining 2. Enteric Fermentation 3. Rice Cultivation 4. Burning wood, grass 5. Landfills 6. Animal Waste 7. Sewage Treatment 7 Human Sources of Methane...
Nitrogen • Important for life- amino acids, proteins, DNA • 80% of Earths ____ is in the atmosphere as gas N2 o Not available to most organisms
Nitrogen Fixation process that converts N2 to ammonia (NH4+) or nitrate (NO3-)
Ammonia and nitrate can then be used by plants and microbes o Animals receive N by eating other organisms with N After Nitrogen Fixation, ammonia and nitrate are used by...
Rhizobium-N fixing bacteria in root nodules of legumes (bean family)
Frankia-N fixing bacteria in roots of Alder trees (100kg N per hectare)
Azobacter & Clostridum free living soil bacteria
Azobacter & Clostridium free living soil bacteria
Cyanobacteria fixation occurs in special cells, heterocyst (75% N fixation in aquatic systems)
High Energy N Fixation lighting, cosmic radiation, meteorites (~10% of total natural N fixation)
Nitrogen/ Phosphorous ____ is limited in salt water & ____ is limited in freshwater
Decomposition release N back into the environment
Ammonification the breakdown of organic molecules (proteins and amino acids) to release ammonia (NH4+)
Nitrification converting ammonia to:  Nitrite (NO2-) by bacteria Nitrosomonas  Nitrate (NO3-) by bacteria Nitrobacter
Dentrification returning NH3+ to N2 gas  Occurs in anoxic environments (no oxygen)
Eutrophication o Too much nitrogen in an aquatic system o Causes overgrowth of algae/phytoplankton blooms o Causes fish kills o N is growth limited in most marine/coastal systems
Phosphorous Vital element- RNA, DNA, ATP
Phosphorous • Does not have a dominant gas phase (atmosphere) o Typically found as small particles in the atmosphere • Major reservoir- sedimentary rock
Biosphere • P in ____ comes from sediments through weathering • Oxidized in phosphates (PO4-3), enters soils and water (hydrosphere) where taken in by plants
Animals get P from eating other organisms (but lose P from waste products; urine, feces, decomposition) How do animals gain and lose P?
Created by: acorso3
Popular Earth Science sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards