Across 
	5	An imaginary line around the widest part of the Earth. (7)
	8	A material that does not allow electricity to pass through it. (9)
	10	A blood vessel that takes blood away from the heart. (6)
	11	Blood vessels that bring blood into the heart. (4)
	12	A material that allows electric current to pass through it. (9)
	13	The temperature at which a liquid changes to a gas. (7,5)
Down 
	1	When you can see clearly through something. (11)
	2	A substance that is made up of only one type of atom. (7)
	3	Another word for movement. (6)
	4	To use something more than once. (7)
	6	The largest organ in the body. (5)
	7	A thick layer around a plant cell. (4,4)
	9	A person who does experiments to find out how things happen. (9)
	14	The rise and fall of water levels in the sea. (4)