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The amount of water on the Earth doesn't change very much at all. Trace quantities are dissociated into hydrogen and oxygen by sunlight, or launched into space on our various space craft. Water hardly ever arrives on the Earth from space, but a medium sized comet could deliver billions of gallons of water (and knock our civilization into a new Dark Age) if it collided with the Earth.
Many scientists believe that cometary impacts may have provided the majority of Earth's water when our planet was still young.
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Has the amount of water on earth changed over time?
Yes. We currently believe that it has changed over time. It is believed that the Earth was first dry and that water was delivered to it later by cometary or meteoric impactors.
Why does the amount of rock change over time?
Erosion caused by wind and water reduces its mass.
How much has the earth change over time?
How does the hydrosphere change the earth over time
How do you describe the composition of water on earth?
Of the water on Earth, over 90% is in the oceans and is naturally salty. Over 90% of fresh water on the Earth is locked up as ice in Antarctica, and represents about 4% of earth's water. Almost all water (as above) exists as liquid water.
Is there the same amount of water on earth now as there was when earth was formed?
It has the same amount of water as 1000 years ago. Unless this water has been taken off the earth in a spaceship, it will always be on earth, some of it in gaseous for, some in ice, and some in water. Most of the earth's water is non-potable (meaning you can't drink it its not clean). Water is always recycled, for instance, the water you drink today, could also have been drunk by a dinosoar, then peed out. The water would be recycled over time, with all the bad things coming out when it evaporates, then it rains back to the earth as pure clean water.
How does the earth's surfaces change?
earth changes over time do to water wind and glacier
What does Balance in the water cycle means?
the average annual precipitation over Earth equals the amount of water that evaporates
Has the amount of water on earth changed over time?
Yes. We currently believe that it has changed over time. It is believed that the Earth was first dry and that water was delivered to it later by cometary or meteoric impactors.
Do you have the same amount of water on earth had when the dinosaurs when they were on this planet?
In all likelihood, probably. The water cycle would make sure that all the water on the Earth would be used, evaporated, and then sent down into the Earth over time. The amounts of water may have changed slightly over time, but the relative amount of water hasn't changed much at all, just the water placement and it's distribution.
Can the oceans drown the lands?
Not with the current amount of water on earth, there would still be land left over
Why does the amount of rock change over time?
Erosion caused by wind and water reduces its mass.
How much has the earth change over time?
How does the hydrosphere change the earth over time
The amount of water found on Earth today is 7 percent less than 100 years ago due to global climate change?
Over the Earth as a whole, this could not possibly be true. In one specific region, it could be, but it would be difficult to attribute to a changing climate whether or not that is the cause. Water is constantly cycled through the atmosphere and earth, so there would be about the same amount of it regardless of what the climate does.
Has the amount of uranium in Earth increased over geologic time Has the amount of lead in Earth increased?
The amount of uranium decreasesd, the amount of lead increased over geologic times.
Is the water on earth the same as from the water years ago?
During global warming all of the water was frozen leading to not much water now that it got warmer (green house affect ) there is more water now than then written by a fifth grader
Does everything perish over time?
Most everything. Water would be the exception. The amount of water on Earth is always the same, it is just in different stages of the water cycle at different times.
Is fresh water evenly spreaded out over the earth?
fresh water is evenly distributed over earth
