The layer of the atmosphere above the stratosphere but below the thermosphere, from 50 to 85km altitude.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and...

The building blocks of proteins and polypeptides.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...

A change in a DNA sequence.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce abstract...

Molecules with identical molecular formulas but in which the atoms are arranged differently.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise...

Any process in which one or more chemicals are changed into different products, by the breaking and formation of chemical bonds.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds...

Definitions and examples of three distinct chemical classifications: elements, compounds and mixtures.
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Chemistry - Atoms And Bonding - L
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rning Points.
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Open a discussion on...

The emission of particles as a result of the spontaneous decay of atomic nuclei.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual...

A substance composed of more than one chemical element, whose atoms are held together by strong chemical bonds and are combined in a fixed ratio.
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A Twig Science
Glossary Film.
Key scientific terms defined in...

A mixture of two or more substances which remain as physically separate substances.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual...

The different ways animals view the world, from colour perception to UV rays.
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Physics - Waves - L
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rning Points.
/> A Twig FactPack Film.
Open a discussion on what has been already learnt in a topic,...

Very strong chemical bonds between oppositely charged ions. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce...

A substance produced as the result of a chemical reaction. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce...

The lower and most dense part of the atmosphere, extending to an altitude of about 20km at the equator and 11km at the poles. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise...

In optics, the point at which rays of light converge after refraction or reflection, and so the point at which a sharp image will be produced. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning...

When individuals of different species live together in a close and long-term relationship. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...

Mr. Griot reviews the definitions of homonyms, homophones, and homographs.

Mr. Griot reviews the definitions of the words compare and contrast and discusses the steps to take when planning, organizing, and writing a comparison and contrast essay.

Miss Palomine meets her friend April for lunch and talks about how she and April like things that are opposites. This leads to a discussion of opposites in which Miss Palomine provides examples. She then asks the student to help her...

Miss Palomine leads a discussion about the ways in which the student may be like his favorite animal by comparing and contrasting.

Miss Palomine compares photographs of herself and puts them on a sheet marked before and after. She talks about how her characteristics have changed.

“Let’s Talk about Opposites” defines antonyms and gives many examples.

Synonyms and Antonyms defines and provides examples of synonyms and antonyms and identifies examples of each in text.

Compare and Contrast Text Structure identifies the common characteristics of the compare and contrast structure of informational text.

People of the Amazon and Rio de Janeiro compares and contrasts the daily lives and economic decisions of people in the Amazon and Rio de Janeiro.