what element makes up 66% of the hydrosphere??

Question

science homework

Answer 1

Right off I would assume that the answer is hydrogen if the question is asking for an element because there are 2 hydrogens for each oxygen in water. However, oxygen is a much heavier atom than hydrogen, so the answer is probably oxygen. See, it really depends on if the question is asking for 66% in terms of numbers of atoms or mass. If it's numbers, the answer is hydrogen, but if it's mass, then it's oxygen.

Water is H2O, but H2O is a molecule, not an element.

Answer 2

Hydrosphere is the collective term used for all water on earth including the seas and oceans, ice-caps, lakes and rivers, water vapor etc.

Water molecules consist of 1 oxygen atom and 2 hydrogen atoms - hence the name H20.

On this basis you could say that hydrogen is the element that makes up 66% of the hydrosphere (66⅔% is the actual figure so it's closer to 67% than 66%).

But... technically no element makes up 66% of the hydrosphere. In terms of the mass of the elements hydrogen has a mass of 1 AMU (Atomic Mass Unit) and oxygen has a mass of 16AMU which means the hydrosphere is 88% oxygen and 12% hydrogen by mass.

Answer 3

With the hydrosphere being the water covering the earth, you probably are referring to the H of H2O. However, % is not always measured in number of atoms.Yes it is 66% of the atoms of H2O but usually % is by weight where H would lose out. H would lose i it was measurred by volume also which is another way to express % of a material.

Answer 4

1.-chemical symbol of water- H2O
2.-elements present- oxygen and hydrogen
3.-their atoms present in one molecule of water-2 atoms of hydrogen and 1 atom of oxygen
4- their ratio- 2 : 1
thus,i conclude that hydrogen makes 66% of hydrosphere

Answer 5

Hydrosphere (Greek hydro means "water") in physical geography, describes the collective mass of water found on, under, and over the surface of a planet.


Earth's hydrosphere

The Earth's hydrosphere consists chiefly of the oceans, but technically includes all water surfaces in the world, including inland seas, lakes, rivers, and underground waters. The average depth of the oceans is 3,794 m (12,447 ft), more than five times the average height of the continents. The mass of the oceans is approximately 1.35 × 1018 tonnes, or about 1/4400 of the total mass of the Earth.

The abundance of water on Earth is a unique feature that distinguishes our "Blue Planet" from others in the solar system. Approximately 70.8 percent (97% of it being sea water and 3% fresh water[1]) of the Earth is covered by water and only 29.2 percent is landmass. Earth's solar orbit, vulcanism, gravity, greenhouse effect, magnetic field and oxygen-rich atmosphere seem to combine to make Earth a water planet.

Earth is actually beyond the outer edge of the orbits which would be warm enough to form liquid water. Without some form of a greenhouse effect, Earth's water would freeze. Paleontological evidence indicates that at one point after blue-green bacteria (Cyanobacteria) had colonized the oceans, the greenhouse effect failed, and Earth's oceans may have completely frozen over for 10 to 100 million years in what is called a snowball Earth event.

On other planets, such as Venus, gaseous water is destroyed (cracked) by solar ultraviolet radiation, and the hydrogen is ionized and blown away by the solar wind. This effect is slow, but inexorable. This is one hypothesis explaining why Venus has no water. Without hydrogen, the oxygen interacts with the surface and is bound up in solid minerals.

In the Earth's atmosphere, a tenuous layer of ozone within the stratosphere absorbs most of this energetic ultraviolet radiation high in the atmosphere, reducing the cracking effect. The ozone, too, can only be produced in an atmosphere with a large amount of free diatomic oxygen, and so also is dependent on the biosphere (plants). The magnetosphere also shields the ionosphere from direct scouring by the solar wind.

Finally, vulcanism continuously emits water vapor from the interior. Earth's plate tectonics recycle carbon and water as limestone rocks are subducted into the mantle and volcanically released as gaseous carbon dioxide and steam. It is estimated that the minerals in the mantle may contain as much as 10 times the water as in all of the current oceans, though most of this trapped water will never be released.

The water cycle describes the methods of transport for water in the hydrosphere. This cycle includes water beneath the Earth's surface and in rocks (lithosphere), the water in plants and animals (biosphere), the water covering the surface of the planet in liquid and solid forms, and the water in the atmosphere in the form of water vapor, clouds, and precipitation. Movement of water within the hydrosphere is described by the hydrologic cycle. It is easy to see this motion in rivers and streams, but it is harder to tell that there is this motion in lakes and ponds.

The characteristics of the ocean that affects its motion are its temperature and salinity. Warm water is lighter or less dense than cold water which is more dense or heavier and salty water is also more dense than fresh water. The combination of the water's temperature and salinity determines whether it rises to the surface, sinks to the bottom, or stays at some intermediate depth.

Answer 6

Hydrosphere = FULL OF WATER!!! H2O, H3O, and H+

What makes up 66% of the hydrosphere? Hydrogeeeeen!

Answer 7

Hi. Come one! H2O. Get it? H times 2 times 1 oxygen.

Answer 8

i might throw a curve ball at all of these other answers here, but my guess would be salt... from the oceans of the world... oceans make up about 70% (maybe less) of the hydrosphere and there is salt in all of them

Answer 9

hydrosphere is water. water consists of hydrogen and oxygen.

also, atmosphere is air

Answer 10

H2O