Solar System

Saturn is a gas planet, although the Earth is not. The Earth is mainly made up of dense rock with an iron core, whereas Saturn mainly consists of a huge hydrogen atmosphere surrounding a small icey core.

Take a look at my scale model page to give you some idea.

I can't really send you much general information, but if there is something in particular you want to know I may be able to help you.

This site doesn't currently contain much information on asteroids, although there is a good definition of an asteroid in the answer to a previous question.
For more detailed information, look at this page of links about asteroids.

Approximately -230°C

I think it is important to respect everyones right to a different opinion. This is obviously a subject which is strongly debated by both sides, and under such circumstances it's essential to be open minded and to understand the facts. Why don't you take a look at Creation Vs. Evolution for a complete discussion of both sides of the argument.

This varies depending on the exact positions of the planets, between a minimum of 78 million kilometres and a maximum of 378 million kilometres.

There are plenty of sites about the solar system available on the web. Try this site by Leceister University or this one by NASA for more information.

1. What does revolution mean and rotation mean?
2. Why are the average temperatures of each planet so varied?
3. Definitions of - asteroids, meteors, meteorites and comets?
4. When the planet rotates, what changes are there?

1. They have quite similar meanings. If an object completes a single revolution it means that it has spun round 360 degrees, and is back to where it began. Rotation means that it is spinning around a certain axis.
2. The average temperature of a planet depends on many things. The distance from the Sun is of course very important, but it also depends on how much energy is reflected by the planet (how bright it is), the composition and density of the atmosphere and the amount of radioactive elements in its core.
3. This is a good question. There are small differences between each of these terms. An asteroid is a lump of rock, travelling in space which is too small to be called a planet. Asteroids which are on a collision course with Earth are called meteoriods. These meteoriods enter the Earth's atmosphere and burn up due to friction. This is a luminous phenomenon called a meteor, commonly known as a shooting star. A meteorite is a part of a meteoroid that survived its journey through the Earth's atmosphere and has been found on Earth.
4. When a planet rotates it can result in the planet being distorted from a perfect sphere into a slightly squashed one because of the centrifugal force. Spinning also created a dynamo effect in planets with cores containing iron which generates large magnetic fields.