This theory states that the universe began in a very hot and dense sphere that expanded and eventually condensed into galaxies.

The number of stars in our solar system

The most commonly used measurement for distance in astronomy

What is a common characteristic of the outer planets

This causes tides

Where stars begin their life cycle

Spring tides differ from neap tides in that

The main gas in Earth's atmosphere is

Earth's ozone layer protects us from

A high pressure system usually brings

Climate is

Cold fronts

Obsidian is a rock that is formed by cooling lava. It is

Fossils are found almost exclusively in

Metamorphic rocks are formed when

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