Marine Science IGCSE Unit 2 / Seawater Quiz

What pH value is assigned to an acidic solution?

• above 7

• above 9

• below 3

• below 7

What pH value is assigned to an alkaline solution?

• above 7

• below 3

• below 7

• above 9

Define atmosphere.

• Layer of gases surrounding the Earth

• The weather on Earth

• How clear or foggy the sky appears

• How good a party is

Atmospheric Dissolution: The dissolving of atmospheric ------ in water.

Name the smallest particle of a substance that can take part in a chemical reaction.

• Atom

• cell

• proton

• Ion

Bioluminescence is the biochemical release of _____ by living organisms.

A substance formed from two or more elements is called a

• compound

• solvent

• mixture

• solution

What is detritus?

• Dead bodies of fish and marine mammals on the sea floor

• The name for skin cells of marine mammals

• Solid remains and waste from living organisms

• What is on a teenager's bedroom floor

The random movement of particles from an area of higher concentration to an area of lower concentration is called _________

The warm current that originates off the coast of Ecuador, usually in December, and causes death in local food chains is called

• El Nino

• El Ecuador

• La Nina

• El Salvador