f. The band of dust and rocks between Jupiter and Mars is called the .
g. The coldest planet is
This is because it is the from the
h. The Sun is an example of a .
i. j. is the force of attraction
between two objects that are not in .
is equal to mass in multiplied by the
gravitational force.
2. Describe what is meant by the Big Bang theory.
3. Put the following in order of size (smallest first): the Sun, the Moon, the galaxy, Earth, Halley’s Comet. Write a sentence about each to explain what it is.
5 2 . . inner and in our solar model of the solar
system has the Earth at the of the universe.
model of the solar system
states that all the planets the
.
6. Give three reasons why life has developed on Earth and not on other planets.
7. Create a poster, as a revision tool, that explains the difference between various celestial bodies.
8. Copy and complete the crossword. Across 2. The ‘red planet’ (4)
4. Planet with an atmosphere that mainly consists of nitrogen and oxygen (5)
5. Largest planet in our solar system (7) 6. Planet closest to the Sun (7)
Down 1. Separates the inner planets from the outer planets (8, 4)
2. Name of the Earth’s natural satellite (4)
3. Number of moons orbiting Venus (4) Chapter 21 crossword
1
4. State one similarity and one difference between the inner and outer planets.
5. Define the word ‘planet’ in such a way that it includes objects such as the Earth, Mars and Jupiter but does not include objects such as Pluto or the Sun.
21.4
3 4
6
Across
2. The ʻred planetʼ 4. Planet with an atmosphere that mainly consists of nitrogen and oxygen
5. Largest planet in solar system 6. Planet closest to the Sun
Down
1. Separates the inner planets planets
2. Name of the Earthʼs moon 3. Number of moons orbiting Ve
