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Determine if the following samples are pure substances or mixtures.    Sample A: Sample A is a [A] Sample B:  Sample B is a [B] Sample C: Sample C is a [C]  

Dark-line (absorption) spectra can be used to identify the ________ present in stars.

Relatively small bodies which generally orbit between Mars and Jupiter are called ________.

What two elements formed first?

The Sun is considered a(n) ________ star.

The ________ scale is an earthquake magnitude scale is based on the energy released by the earthquake.

 ________ is a system of ideas that attempts to explain observations and make predictions about future observation.

What is the main factor that determines what will happen to a star after it consumes all of its nuclear fuel?

A cluster of fibers at one end of a neuron that receives messages from other neurons is called

The Appalachians were formed by three phases of ________ orogeny.