US and Canadian researchers recently calculated the total amount of the world’s groundwater and estimated that it is equivalent to a lake 180 metres deep covering the entire Earth. This makes groundwater the largest active freshwater resource on the planet.
Which is Earth’s largest source of drinkable water quizlet?
The largest source of usable fresh water is groundwater.
Which country has the most drinking water?
Total Renewable Internal Freshwater Resources
| SN | Country | Total renewable water resources (km³) |
|---|---|---|
| 1 | Brazil | 8,233 |
| 2 | Canada | 4,100 |
| 3 | Russia | 4,067 |
| 4 | United States | 3,069 |
Which best describes the source of oxygen in ocean water?
Which best describes the source of oxygen in ocean water? Oxygen is produced by marine plants in the process of making food. Oxygen is produced through the exhalations of marine animals.
Which is the main source of dissolved oxygen in the ocean?
The major biological source of dissolved oxygen in the ocean comes from photosynthesis by phytoplankton.
Which country has cleanest water?
If not, let’s take a look at our list of 10 countries that can be proud because of the cleanest water on the planet.
- Denmark. …
- Singapore. …
- Sweden. …
- Austria. Source: maps.google.com. …
- Iceland. Source: maps.google.com. …
- Germany. Source: maps.google.com. …
- Greenland. Source: maps.google.com. …
- Switzerland. Source: maps.google.com.
What is the dirtiest water in the world?
Where Is The Dirtiest Water In The World?
- Citarum River. Citarum River in Indonesia has more than 500 factories built along its banks with each of them dumping their waste into the river. …
- Riachuela River. Riachuela River in Argentina is considered the largest open pit toilet in the world. …
- Lake Karachay. …
- Lake Tai. …
- Yamuna River.
12 июн. 2018 г.
What country has no clean water?
1. Eritrea: 80.7% lack basic water services. The population of Eritrea in East Africa has the least access to clean water close to home. Lack of adequate household sanitation means open water sources are often contaminated by human and animal waste.
Which best describes the most abundant form of ocean life?
Oceans
| Question | Answer |
|---|---|
| Entire ocean food webs would collapse and all other ocean organisms would probably not survive if this food source were not available | plankton |
| Are fish, algae or microbes the most abundant form of ocean life? | microbes |
What is the largest zone in the ocean?
The water temperature is constantly near freezing and only a few creatures can be found at these crushing depths. The deepest zone of the ocean, the hadalpelagic zone extends from 19,700 feet (6,000 meters) to the very bottom at 36,070 feet (10,994 meters) in the Mariana Trench off the coast of Japan.
What would happen if plankton were removed from marine food webs?
Nearly all small marine predators eat plankton as their primary food source, so if the plankton were to disappear, then the small predators wouldn’t be far behind. … Not only would those populations be without a significant food source, but local trade would suffer, and their economies would start to collapse.
How do fish get oxygen?
Fish breathe with their gills, and they need a constant supply of oxygen. Gills sit under the operculum. This is called the gill slit. Many fish have four pairs of gills, while sharks may have up to seven.
Does water move oxygen?
Water at higher altitudes holds less oxygen. Fast-moving water generally has more oxygen than still water, because the movement mixes the air into the water. … Water with lots of aquatic plants have higher levels of dissolved oxygen, since submerged plants produce oxygen through photosynthesis.
How much dissolved oxygen is in the ocean?
As oxygen in the atmosphere is about 20.3%, the partial pressure of oxygen at sea level (1 atm) is 0.203 atm. Thus the amount of dissolved oxygen at 100% saturation at sea level at 20° C is 9.03 mg/L ¹⁰.