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Hepatitis b surface ab(antibody) ql (qualitative) reactive is the prior exposure of hepatitis b. This exposure could be a natural exposure or that of a vaccine.
Exposure of rocks at the earth's surface to water and atmospheric conditions is most likely to cause erosion. The Grand Canyon is a good example of this type of exposure.
When a meteor reaches the Earth's surface, it is classified as a meteorite.
They are destroyed by weathering after exposure to the surface.
Bones are classified to make it easier to study them. They are often classified by shape, size, and by origin. They may also be classified by their surface markings.