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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.

The high surface temperatures of ________ have been attributed to the greenhouse effect.

Streams of protons and electrons emitted from the Sun produce ________.

In North America the highest potential for large tsunamis is in the coastal regions of ________.