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A structural unit that is repeated in three dimensions is called a 

In still air at constant pressure, the rate of evaporation depends on the 

The core of Earth is composed of 

A moraine is a 

The difference in brightness between two stars is related to the 

A naturally occurring, inorganic, solid element or compound with a crystalline structure is a 

The S-wave is a 

A person standing where the Moon’s penumbra touches Earth will see

Condensation nuclei could be 

The deposit at the mouth of a river where sediments are dropped is called a