This drawing shows the water cycle.
Click on image for full size
Carbonate is a name for rocks and minerals which contain a molecule made of both carbon and oxygen known as CO32-. (CO32- is also known as the molecule carbonate).
Limestone is an example of a calcium carbonate, CaCO3, which means a combination of calcium (Ca2+) and carbonate (CO32-). Other examples of carbonates include calcite, dolomite, and marble.
Limestone is a fine-grained calcium carbonate and dissolves easily in rainwater, especially rainwater which is loaded with carbon dioxide in the form of carbonic acid. The more carbon dioxide in the rain, the more easiy limestone and marble dissolve.
As a result of human activity such as the burning of fossil fuels which inject more carbon dioxide into the air, limestone more readily dissolves. This process also helps to remove carbon dioxide from the atmosphere. Another way of looking at that same process is that a way to remove excess carbon dioxide from the atmosphere is by the dissolution of carbonates such as limestone and marble. The removal of carbon from the atmosphere and recycling in the ocean is part of the carbon cycle.
Shop Windows to the Universe Science Store!
We have beautiful specimens of banded iron formation
in our online store
from Nature's Own, along with many other mineral
You might also be interested in:
Carbon dioxide (CO2) is a kind of gas. There isn't that much carbon dioxide in Earth's atmosphere, but it is still very important. Carbon dioxide is a greenhouse gas. That means it helps trap heat coming...more
An aquifer is the name for a layer of rock which is capable of holding a large amount of water. Some layers are better at holding water than others, for example a layer of sandstone can hold a good deal...more
Carbonate is a name for rocks and minerals which contain a molecule made of both carbon and oxygen known as CO32-. (CO32- is also known as the molecule carbonate). Limestone is an example of a calcium...more
The deep ocean waters are under pressure and are much colder than layers of the ocean which are closer to the surface. Dissolved carbon dioxide seems to be absent from the deep ocean water and as a result...more
One process which transfers water from the ground back to the atmosphere is evaporation. Evaporation is when water passes from a liquid phase to a gas phase. Rates of evaporation of water depend on things...more
The water at the ocean surface is moved primarily by winds that blow in certain patterns because of the Earth’s spin and the Coriolis Effect. Winds are able to move the top 400 meters of the ocean creating...more
Rivers are very important to Earth because they are major forces that shape the landscape. Also, they provide transportation and water for drinking, washing and farming. Rivers can flow on land or underground...more