Approximately -273° C; the lowest possible temperature

A compound that releases hydrogen ions when dissolved in water; has a pH of less than 7

Simple, one-celled plantlike organism found in water or damp places; includes seaweeds, pond scum, and so on

A substance composed of two or more metals

The layer of air surrounding Earth

The pressure exerted by the atmosphere on every part of Earth's surface; approximately 10 newtons per square centimeter

The smallest part of an element that is recognizable as that element

An instrument that measures atmospheric pressure

A compound that releases hydroxide ions in water; has a pH of more than 7; is sometimes called an alkali

The temperature at which additional thermal energy causes a substance to change from a liquid to a vapor

A quantity of heat energy; the amount needed to raise the temperature of one gram of water 1° C

An organic compound-like sugar or starch that contains carbon, hydrogen, and oxygen in the ratio of 1:2:1; the human body's main source of energy

A cancer-causing agent

Meat-eater

A substance that speeds up a chemical reaction without being changed by the reaction

The lowest-level structure of any living organism that can perform all the functions of life, including reproduction

The main pigment in plants that captures light energy during photosynthesis

A substance composed of two or more chemically bonded elements

The exact amount of substance dissolved in a given amount of solvent; refers to a solution

The process whereby a decrease in energy causes vapor particles to return to a liquid phase

A material that allows heat or electricity to flow through it with minimal resistance

A sample in which no variables are tested, thus serving as a basis for comparison

A variable that stays constant in an experiment, allowing the effect of another variable to be measured

The circulation of fluid caused by warm fluid rising and cool fluid sinking

In a physics sense, the amount of mass per unit volume; in a more general sense, the quantity per unit area or volume

The scattering of light; the spreading of a liquid or gas from areas of higher concentration to areas of lower concentration

Nucleic acid in the cells of an organism; contains the genes of an organism and transmits these to future generations

A sequence of changes in the plant and/or animal life of a region over time

A negatively charged fundamental atomic particle

A substance consisting of exactly one type of atom

Wearing away; typically the washing away of sand or rock by running water or wind

The changing of a fluid into gas

The preserved remains of a very old organism

The number of cycles per unit time of a repeating phenomenon

A simple sugar that is broken down to provide energy to an organism

The part of an ecosystem where a plant or animal naturally grows or lives

An animal that eats only plants

A chemical substance secreted by a gland of the body that affects other parts of the body

The amount of water vapor in the air

A statement that is a proposed explanation of a scientific phenomenon

Electromagnetic waves whose wavelength is longer than that of visible light

A substance that blocks the flow of heat or electricity

A molecule or atom that has become charged by either gaining or losing an electron

A variety of an element with the same number of protons per atom but a different number of neutrons

The energy of an object due to its motion

The temperature at which additional thermal energy breaks the chemical bonds holding a substance together and causes the substance to change from the solid to a liquid state

The smallest unit of a chemical compound

A fundamental atomic particle that has no charge

A piece of rock from which metal can be profitably extracted

The movement of liquid through a membrane

An organism that invades another organism and feeds off it

A numerical scale from 1-14 representing the acidity or alkalinity of a solution; 1 is very acidic, 14 is very alkaline, and 7 is neutral

The process in which plants use the sun's energy to convert carbon dioxide and water into glucose

Force per unit area

A complex molecule composed of amino acids that carries out a variety of processes in cells

A positively charged fundamental atomic particle

A complex carbohydrate found in potatoes, rice, corn, and many other vegetables

A close relationship between two organisms that is mutually beneficial

Electromagnetic waves with wavelength shorter than that of visible light

The gaseous form of a liquid

Electromagnetic radiation with wavelength shorter than ultraviolet radiation

The force that attracts one object to another and is dependent on mass, is known as

The acidity or alkalinity or a substance is measured using the ____ scale, which ranges from 1 to 14.

An electromagnetic wave with a wavelength longer than that of X-rays, but shorter than that of visible light is in the ____ part of the spectrum.

The energy an object has when it is stationary is known as its ____.

The changeable parameters in an experiment as the ____.

The central part of an atom, which is orbited by electrons is the ____.

A term which does not change its value is a ____.

A neutral particle found in the center of an atom is a ____.

When a liquid is cooled below its freezing point, it becomes a ____.

An animal that eats both plants and meat is an ____.

____ orbit the nucleus of an atom.

A compound which may induce cancer is a ____.

Absolute zero is ____ degrees Celsius.

____ is the mass per unit volume.

The energy associated with a moving object is the ____ energy.

Conduction

Convection

Polarity

Potential Energy

Capacitor

Buoyancy

Radiation

Frequency

Mechanical energy

Electrical Circuit

Waves

Acceleration

Resistor

Four States of Matter

Amplitude

Volt

Velocity

Density

Work

Electrical Current

Charge

Wavelength

Ampere

Kinetic Energy

Potential Energy

Condensation

Molar Mass

Atom

Ion

Freezing Point

Endothermic

Reactant

Solute

Evaporation

Solvent

Solution

Acid

Atomic Number

Electron

Melting Point

Neutrons

Nucleus

Product

Molecule

Base

Viscosity

Atomic Mass

pH

Proton

Exothermic

Boiling Point

Isotope

Phenotype

Prokaryotic Organism

Genotype

Digestive System

Nucleobases

Osmosis

Mitosis

Eukaryotic Organism

RNA

DNA

Genes

Ribosome

Respiratory System

Pollination

Proteins

Meiosis

Stages of Cellular Division

Circulatory System

Allele

Chromosomes

Metamorphosis

Mitochondrion

Photosynthesis

Dominant and Recessive Traits

Osmosis

Hypothesis

Control

Matter

Air Resistance

Three Primary Layers of the Earth

Gas Giant

Dependent Variable

Terrestrial Planet

Mass

Altitude

Five Primary Layers of the Atmosphere

Orbit

Erosion

Independent Variable

Metamorphism