How many planets are there?

What orbits around the sun?

What do moons orbit?

Order these by size....

Planets, Moons, The Sun, Comets, Asteroids.

How do the motions of planets, comets, asteroids, the sun, and moons differ?

How long ago was the solar system formed?

How was the solar system formed?

What does a galaxy contain?

Arrange these in order of size...

Earth
Milky Way to Galaxy
The Sun
The Solar System
The Milky Way
The Earth's Orbit
Sun to Nearest Star

Where does the evidence for the distant stars and galaxies come from?

What speed does light travel at?

What is a light year?

How can the distance of a star be measured using parallax?

How can the distance of a star be estimated from its relative brightness?

What interferes with observations of the night sky?

Why are there uncertainties about the distances of stars and galaxies?

What is the source of the sun's energy?

Where were all chemical elements with atoms heavier than helium made?

What does the redshift in the light coming from galaxies suggest?

The ________ a galaxy is, the _______ it is moving _______ from us.

How does the motion of galaxies suggest that space itself is expanding?

Order these by age...

The Earth
The Sun
The Universe

How do scientists believe the universe began?

Why is the fate of the universe difficult to predict?

How do rocks provide evidence for changes in the Earth?

What would happen if mountains were not continually being formed?

How can the rock processes seen today account for past changes?

How can the age of the Earth be estimated?

Explain Wegner's theory of continental drift.

What is the evidence for continental drift?

How does Wegener's theory account for mountain building?

Why were Wegener's suggestions rejected at the time?

What is seafloor spreading?

How much do seafloors spread by each year?

How can the pattern in the magnetisation of seafloor rocks on either side of the oceanic ridges be explained?

Where do earthquakes, volcanoes, and mountains generally occur?

How does the movement of tectonic plates cause earthquakes, volcanoes, mountains, and contribute to the rock cycle?

What types of waves do earthquakes produce?

What are the differences between P-Waves and S-Waves?

How can differences between wave speeds and behavior of P-Waves and S-Waves give evidence for the structure of the Earth?

Label a diagram of the Earth to show its crust, mantle and core.

What is a wave?

What is the frequency of waves?

What is the unit for wave frequency?

What is wavelength?

What is amplitude?