Glossary results for "R"

a simple machine that converts rotational motion into linear motion

to spread out in rays from a central point

the use of radiation to diagnose and treat medical conditions

a chemical element with the symbol Ra and atomic number 88

a line segment that goes from the center of a circle to the edge of the circle

a radioactive gas that is found in the ground

water that falls from the sky

a biome characterized by high rainfall, high humidity, and diverse plant and animal life

a line that has one endpoint and goes on forever in one direction

when something happens to something else

something that is written down or saved so that it can be remembered

the process of collecting and processing materials that would otherwise be thrown away as trash and turning them into new products

the most common type of blood cell

to make something smaller

when light bounces off of an object

when light bends when it goes from one material to another

trucks that are used to transport perishable goods, such as food, medicine, and flowers

energy that can be replaced or renewed

to push something away

the process of making new copies of something

cold-blooded animals that have scales and lay eggs

the process of gathering information to answer a question or solve a problem

a large body of water that is stored for later use

the property of a material that opposes the flow of electricity

a device that slows down the flow of electricity

the process by which living things get energy from food

a state of reduced activity

the outcomes of an experiment or investigation

the act of using a product or material again for its original purpose or for a new purpose

to do something in the opposite way

a chemical element with the symbol Re and atomic number 75

a chemical element with the symbol Rh and atomic number 45

a structure of bones that surrounds and protects the thoracic cavity

a Nobel Prize-winning physicist who made significant contributions to quantum mechanics, particle physics, and quantum electrodynamics

an Italian-American scientist who made significant contributions to the fields of neuroscience and cell biology

a constructed path that allows for the passage of people, animals, and vehicles

an English natural philosopher and chemist who is considered the "father of modern chemistry"

an English scientist credited with coining the term "cell"

a planet that is made up of mostly rocks and metals

a chemical element with the symbol Rg and atomic number 111

a structural element that covers the top of a building to protect it from the weather

an underground organ of a plant that typically grows downward

a British scientist who made important contributions to the understanding of the structure of DNA

to turn around on an axis

a material that is stretchy and bouncy

any unwanted or discarded material

a chemical element with the symbol Rb and atomic number 37

a chemical element with the symbol Ru and atomic number 44

a synthetic chemical element with the symbol Rf and atomic number 104