A prism Student activity Play

A prism Slideshow Play

A prism Whiteboard exercise Play

Building the pyramids Whiteboard exercise Play

Ecological pyramids Student activity Play

Ecological pyramids Whiteboard exercise Play

Egyptian pyramids Animation Play

Examples of ecological pyramids Slideshow Play

Food chains Class activity Play

How food chains work Student activity Play

Images in lenses Animation Play

Images in lenses Whiteboard exercise Play

Images in lenses Student activity Play

Inverted pyramids Illustration Play

Pesticides in the food chain Slideshow Play

Pyramids Student activity Play

Pyramids of energy and biomass Slideshow Play

Pyramids of numbers Student activity Play

Sample food chains Illustration Play

Similar prisms and pyramids Student activity Play

Similar pyramids Whiteboard exercise Play

Similar square-based pyramids Whiteboard exercise Play

Sweet pyramids Animation Play

The formation of an image by a spherical mirror Student activity Play

The size and location of an image Animation Play