Earth Science Chapter 3 Review

What causes plankton blooms and hypoxia in the Gulf of Mexico?

• Nutrient-rich runoff

• Overfishing

• Oil spills

• Climate change

What is the effect of hypoxia on marine organisms in the Gulf of Mexico?

• Increases biodiversity

• Kills or displaces marine organisms

• Improves water quality

• Enhances fish population

What is being debated by the U.S. government and farmers regarding the Gulf of Mexico's dead zone?

• Increasing fishing quotas

• Cutting down on fertilizer use

• Building more dams

• Introducing new fish species

What is the basic unit of matter?

• Molecule

• Atom

• Cell

• Compound

What does the nucleus of an atom contain?

• Electrons and protons

• Neutrons and electrons

• Protons and neutrons

• Electrons only

What moves around the nucleus of an atom?

• Protons

• Neutrons

• Electrons

• Molecules

What is an element?

• A mixture of substances

• A substance that can be broken down into other substances

• A substance that cannot be broken down into other substances

• A compound of different atoms

What is a covalent bond?

• Electrons are transferred.

• Electrons are shared.

• Atoms are split.

• Neutrons are shared.

What is an ionic bond?

• Electrons are shared.

• Neutrons are transferred.

• Electrons are transferred.

• Protons are shared.

What is a compound?

• A single element.

• A mixture of gases.

• Substance composed of atoms of two or more different elements.

• A group of molecules.