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a natural or artificial object in space that circles around another object. Can be used to find weather, land conditions, water conditions, water depth.
A device that determines the distance of an object under water by recording echoes of sound waves
The likelihood that each individual may have different reactions to medicines or chances of getting a certain disease.
substance prepared from killed or weakened pathogens and introduced into a body to help the body learn to fight disease.
The 'skin' on the surface of water formed as a result of polarity in water molecules.
Movement of cold, nutrient-rich bottom water to the ocean's surface. Usually occurs along coastal areas.
conservation of mass
the principle stating that matter is not created or destroyed during a chemical reaction
a change in a substance that does not involve a change in the identity of the substance
The process of sending scientists into places seen on satellite images to check the information about the area.
A form of technology that uses living organisms to modify products for specific purposes.
a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found
method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock
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