The part of an atom that contains the subatomic particles that contribute to the atomic mass .

A negatively charged subatomic particle that moves around the nucleus of an atom.

An area surrounding the nucleus of an atom where electrons are likely found .

A particle in the nucleus of an atom that has a positive charge .

A pure substance, made of atoms, that cannot be broken down into simpler substances by physical or chemical means.

The smallest complete unit of a compound with the same properties as the compound .

The smallest particle of an element that has all the properties of that element.

A particular kind of matter.

Relating to the physical composition of an object.

An ordered arrangement of the elements according to atomic number.

A number to the left of a chemical symbol or formula of a substance

Anything that takes up space and has mass.

A small symbol to the right of an element that identifies how many of the elements are present.

An electron in the outer shell of an atom that can combine with other atoms to form chemical bonds.

A way of describing a chemical reaction using chemical formulas and symbols.

A way of describing a substance using chemical symbols and numbers.

The characteristics of a substance as it reacts with others to form new substances with different properties

A process in which one or more substances react to produce one or more new substances.

Law that states matter cannot be created or destroyed in a closed system.

The tendency to undergo a chemical reaction.

The mass of a substance divided by its volume

A change that alters the identity of a substance,resulting in a new substance or substances with different properties.

A change to a substance without forming a new substance,such as changing size or state of matter.

Elements that are typically solid,shiny,malleable,and good conductors of heat and electricity.

A set of principles that explains and predicts phenomena

Elements that are typically not shiny,not malleable,and poor conductors of heat and electricity.

Elements that have properties of both metals and nonmetals;sometimes referred to as semiconductors.

A copy or replica of an object .

A system of units based on multiples of 10 used as a worldwide standard of measurement.

A system of organs and tissues that protects the body from external damage and water loss.

Circulates blood through the body,supplies oxygen and nutrients,and removes waste.

A group of organs that function to provide structural support and protect internal organs.

A group of organs that provides mechanical movement and generates warmth for the body.

A group of organs that transfer oxygen to the blood.

A group of organs and tissues specialized for the rapid transmission and processing of information.

The system of organs that filters and removes waste materials from the body.

A group of organs that function to produce offsprings.

Regulates body by secreting hormones into the bloodstream;also controls growth,reproduction,and metabolism.

a group of organs working together to convert food into energy and basic nutrients to feed the entire body.

The rate at which velocity (speed or direction) changes.

The course along which something travels.

Movement of an object.

The rate of motion, calculated by dividing distance by time.

The speed and direction of a moving object.

A push or pull that causes an object to move, stop, or change direction

Newton’s 2nd law that states the acceleration of an object depends on its mass and the amount of force applied

Newton's 3rd law that states for every action, there is an equal and opposite reaction.

Newton's 1st law that states an object a rest remains at rest and an object in motion remains in motion unless acted upon

The amount of matter in an object

The space between two objects

A push or pull that causes an object to move, stop, or change direction.

The ability to do work or cause change.

Energy that is stored in a system or object

Energy of motion

A form of energy made available by the flow of electric charge through a conductor.

Energy stored in chemical bonds and released through chemical reactions

A form of energy that exhibits wave-like behavior as it travels through space; part of the electromagnetic spectrum

The total kinetic (motion) energy of the tiny particles that make up matter. The faster the particles move, the warmer the matter becomes.

The sum of the potential and kinetic energy of an object

The distance between any two corresponding points on adjacent waves.

A cell lacking a nucleus or any other membrane enclosed organelle

A cell with a nucleus and membrane bound organelle

A membrane bound structure in eukaryotic cells that contains DNA

An organelle in the cytoplasm of the eukaryotic cells that functions in energy production, the power factory of the cell

A protective layer that surrounds a cell

A tough, protective barrier that surrounds the outer membrane of some types of cells

The jelly-like material inside the outer membrane of a cell that holds the nucleus, organelles, and other parts of the cell

A membrane bound organelle in plants that is the site of photosynthesis.

A large, water filled organelle present in all plant cells and some animal cells

A membrane-bound structure inside a cell that performs a specialized function

An organism that gets nutrients from making its own food

An organism that gets its nutrients from consuming other organisms

A single, highly organized and structured piece of DNA

To plot information on a diagram.

An instrument used for measuring wind speed

A piece of equipment made of fire-resistant materials used to extinguish fires.

A container with a pouring spout and measurement marks.

A piece of equipment that flushed water into the eyes or face to remove harmful chemicals

A container marked with a graded scale used to measure the volume of liquids

A huge ball of gas in space that releases heat and light.

The distance light travels in one year, equal to approximately 9.46x 10¹²km.

A large cloud of gas and dust in space.

A graph in which the absolute magnitude of stars is plotted vertically against their surface temperatures.

A grouping of stars, gas, and dust held together by gravity.

An area where the atmospheric pressure is greater than the pressure of the surrounding areas.

A powerful storm with strong winds and heavy rains.

An area where the atmospheric pressure is lower than the pressure of the surrounding areas.

A set of weather conditions, reflecting the pattern of air movement in the atmosphere, that affects a region for a period of time.

A chart showing the weather conditions of a large area.

All matter and energy as a hold, including Earth, the galaxies, and space.

The act of learning, sloping, or slanting.

A circular-shaped galaxy that looks like a flattened disc with arms spiraling from the center.

An imaginary line around which a planet rotates.

To travel in a path around another objects.

The continuous flow of water in a single direction.

The regular rise and fall of ocean levels.

An image taken by a satellite.

the different appearances of the moon caused by the moon's orbit around Earth.

One of four periods of the year, caused by the tilt of Earth away or toward the Sun as it revolves around the Sun.

A map that uses contour lines to show the surface features of an area.

The breaking down of rocks by water, wind, and ice.

A landform made of natural rocks or minerals.

The theory that Earth’s plates move on the fluid mantle, causing major geological events.

A geological feature shaped by erosion.

Water that collects in cracks and pores in underground soil and rock layers.

An area of land where the surface water and groundwater drain into a particular body of water.

Water that flows along Earth’s surface into bodies of water.

The wise use of natural resources in order to protect them.

A structure on Earth’s crust.

The transfer of heat through currents in liquids and gases.

The entire range of wavelengths and frequencies over which electromagnetic radiation extends.

A major wind pattern that affects weather around the world.

Anything people can use.

An instrument that measures the relative humidity of air by using the difference in readings between two thermometers, a wet bulb and a dry bulb.

An instrument that uses lenses to make small objects look larger.

A tool used to examine and observe light.

A tool to measure weight using the force of gravity.

A structure used to organize and record information in rows and columns.

A cylindrical glass tube used in laboratory investigations.

Any nonliving factor in the environment including rocks, air, water, and sunlight.

Any living or once-living organism in an ecosystem.

Any living thing.

All the members of a species living in the same environment.

All the members of a species living in the same environment.

A part of a larger whole.

The reproductive process involving two parents whose genetic material is combined to produce a new organism different from themselves.

A method of reproduction that requires only one parent.

The born young of living organisms; children

A characteristic passed from parents to offspring through genes.

Tool used to sort organisms by paired similarities or differences based on a series of questions.

to vie for the same resources, such as light or food.

An organism that receives energy by eating other organisms.

An organism that hunts other organisms for food.

An organism that hunts other organisms for food.

An organism that is attracted and consumed for energy by another organism.

An organism that makes its own food.

An organism that benefits from living in or on another organism and derives nutrients at the host’s expense.

An organism that provides nutrients and/or shelter for parasites and is harmed by the parasite.

The number of different species of plants and animals in an area.

The ability to maintain the current community at a steady level without exhausting natural resources or causing severe ecological damage.

The amounts of different soil types and minerals found in the soil.

All living and nonliving components in a certain environment.

An ecosystem found on land.

An inland aquatic environment that has a low salt content.

A saltwater environment.

A man made underwater structure that supports marine life.

A system of overlapping and connecting food chains in an ecosystem.

A diagram that shows the trophic levels of organisms in an food web.

A change that occurs over days to hundreds of years.

a change that occurs over thousands to billions of years.

to show or make evident.

A burner used for heating materials.

a tool used to measure length.

a tool used to measure length.

a tool used to measure temperature in degrees.

a tool used to measure time, such as a clock, stopwatch, or timer.

a scale used to measure the mass of an object.

a tool used to perform mathematical operations.

a pair of glasses that protect the eyes and surrounding skin from exposure to chemicals.

Procedures used to keep one safe from danger or harm.

The act or process of using inquiry to gather facts.

Information or proof that helps form a conclusion.