A few sample test questions:

1. The age of the Earth is ____ years old.
   (A) 45 million   (B) 450 million   (C) 4.5 billion   (D) 45 billion   (E) 450 billion

2. Consider the 2 statements: (i) stratospheric ozone absorbs ultra-violet radiation; (ii) water vapour absorbs microwaves
   (A) (i) and (ii) both true   (B) (i) true and (ii) false   (C) (i) false and (ii) true   (D) (i) and (ii) both false

3. The most abundant greenhouse gas in the Earth's atmosphere is
   (A) methane   (B) nitrous oxide   (C) freon-11   (D) carbon dioxide   (E) water vapour