Ph
What pH is recommended for drinking water?
7
What percentage of the earth’s water is salt?
97%
Marine plants use what to make carbohydrates through the process of photosynthesis?
dissolved carbon dioxide, sunlight and water
What is the most recent Era?
The Cenozoic Era
what is the top ocean zone?
Epipelagic zone or the sunlight zone
What pH can fish tolerate?
between 6-8
What percentage of earth’s water is freshwater?
3%
What is vital for marine life?
Dissolved oxygen and carbon dioxide
What is the 2nd most recent Era?
The Mesozoic era
what is the second ocean zone?
Mesopelagic zone or the Twilight zone
What is the pH range?
1-14
What percentage of the freshwater is ice?
68.7%
what process releases oxygen into the water?
photosynthesis
What is the 3rd most recent era?
The Paleozoic Era
what is the third ocean zone?
Bathypelagic zone or the midnight zone
Less than a 7 pH is what?
acidic
What percentage of earth’s water is groundwater?
30.1%
What does respiration do?
it releases energy from carbohydrates and has carbon dioxide and water as byproducts.
What is oldest era?
The Precambrian era
what is the fourth ocean zone?
Abssopelagic zone or the Abyssal zone
More than a pH of 7 is what?
basic
What percentage of earth’s water is potable?
9.12%
Marine animals with gills, such as fish, use these organs to extract what from the seawater?
oxygen
What can index fossils be used for?
to determine the relative age of rock layers
what is the deepest ocean zone?
Hadalpelagic zone or the trenches