1. The decimal system of numbers is made up of 10 separate symbols (the numbers 0 to 9)
How many symbols make up the binary system of numbers?
2. The most common element in the Earth's crust is
3. What comes near to the Earth every 76 years?
4. On the MOH's scale of hardness what is the hardest substance ?
(10 on the MOH's scale)
5. Which of the gases below would not be found in the Earth's atmosphere?
6. What does an ANEMOMETER measure?
7. Which creatures are referred to as 'chiroptera'
8. What is the unit of electrical resistance?
9. Coal, diamond and graphite all have what element in common?
10. Which planet is closest in size to the Earth?