Name:_________________________________________
Date:________________________ Block:______
Warm-up: How has the atmosphere changed over time?
Write true if the statement is true. If the statement is false, change the underlined term to make the statement
true.
____________________ 1. The current atmosphere is made up of mostly carbon dioxide and oxygen.
____________________ 2. Volcanic eruptions played a main role in forming Earth’s early atmosphere.
____________________ 3. The ozone layer was formed after trees released oxygen in the air.
____________________ 4. The very first gases in the atmosphere were hydrogen and helium.
____________________ 5. Cyanobacteria are also called blue-green algae.
____________________ 6. Over billions of years, cyanobacteria formed rock-like mounds called stalactites.
____________________ 7. Cyanobacteria are credited with producting the oxygen rich atmosphere.
Name:_________________________________________
Date:________________________ Block:______
Warm-up: How has the atmosphere changed over time?
Write true if the statement is true. If the statement is false, change the underlined term to make the statement
true.
____________________ 1. The current atmosphere is made up of mostly carbon dioxide and oxygen.
____________________ 2. Volcanic eruptions played a main role in forming Earth’s early atmosphere.
____________________ 3. The ozone layer was formed after trees released oxygen in the air.
____________________ 4. The very first gases in the atmosphere were hydrogen and helium.
____________________ 5. Cyanobacteria are also called blue-green algae.
____________________ 6. Over billions of years, cyanobacteria formed rock-like mounds called stalactites.
____________________ 7. Cyanobacteria are credited with producting the oxygen rich atmosphere.