Which everyday substance when mixed with water forms a solution that conducts electricity?

Which phenomenon explains why distant mountains sometimes appear bluish in colour?

Which type of joint is found in the skull where bones are fixed together and allow no movement?

Which everyday process involves the removal of dissolved impurities from water by passing it through a bed of sand and gravel?

Which animal group is characterised by having a backbone or vertebral column?

Which property of a magnet means it will always realign itself to point in a north-south direction if freely suspended?

Which animal group lacks a backbone and includes insects worms and molluscs?

Which common acid is found in citrus fruits like lemons and oranges giving them a sour taste?

Which type of animal can live both on land and in water, such as frogs and toads?

Which common household acid is found in vinegar and gives it its sour taste and smell?

Which cold-blooded animal group is covered in scales breathes air through lungs and lays eggs on land?