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A ________ results when the outward-directed gas pressure (created by thermal nuclear energy) is balanced in a stable relationship with inward-directed gravitational force; 90% of all stars are in this balance.

If a spit grows as it is deposited and extends completely across the former mouth of an estuary, separating it from the open sea, it has become a ________. (Diagram provided to help you visualize, letters are not relevant for this question)

The term for a star that increases in brightness due to explosively ejecting most all of its mass is a(n) ________.

A ________ is a barrier built at a right angle (perpendicular) to the beach to trap sand that is moving parallel to the shore.

What did Tycho Brahe believe was at the center of our planetary system?

A rainshadow desert forms:

Examine this photograph(s). Identify the feature seen here.  

On a Hertzsprung-Russell diagram, which of the following represents the dimmest star?

Examine the sketch of a bend in a river. The arrows show the water flow direction. In which of the four lettered locations will the water be moving at the highest velocity (and, therefore, cause most of the erosion)?

According to the big bang theory, the first two elements to form in the universe were ________.