1. 
Fill in the blank:

Matter is made up of particles: atoms, molecules, or .

2. 
What is Saturn mostly made of, according to the text?

3. 
The hydrogen inside Saturn is liquid because of the high pressure in the inner regions of the planet.

4. 
What are the two properties shown in Figure 1.1 that follow from matter being solid, liquid, or gas?

5. 
Matter can be elements, compounds, or mixtures.

6. 
Fill in the blank:

Matter occupies a volume in space and has a .

7. 
Fill in the blank:

Saturn and Jupiter are known as ' giants' because of the gases that make up most of their mass.

8. 
Fill in the blank:

The particles in Saturn's rings vary widely in size, from tiny snowflakes to snowballs as large as a .

9. 
What are Saturn's rings made up of, according to the text?

10. 
The ice around Saturn's rings is made of water, the same substance that covers much of the Earth's surface.

11. 
Fill in the blank:

Liquid hydrogen inside Saturn shows metallic properties, which produce the planet's .

12. 
Fill in the blank:

Deep in the centre of Saturn is a small rocky core, surrounded by a layer of gases.