Drawing circuits Student activity Play

Drugs and health Whiteboard presentation Play

During a thunderstorm Student activity Play

Eclipses Student activity Play

Ecological succession Whiteboard presentation Play

Ecological succession Class activity Play

Economics of the extraction of metals Whiteboard exercise Play

Economics of the extraction of metals Student activity Play

Ecosystem Class activity Play

Ecosystem Whiteboard presentation Play

Ecosystem = biocenosis + biotope Student activity Play

Effect of gravitation on a beam of light Student activity Play

Effect of light on the growth of food plants Slideshow Play

Effect of temperature and catalyst on the reaction rate Whiteboard presentation Play

Effect of temperature and catalyst on the reaction rate Class activity Play

Effect of temperature on chemical equilibrium Student activity Play

Effect of temperature on free energy change Student activity Play

Effect of ΔH° and ΔS° on free energy change Student activity Play

Effective collisions Student activity Play

Effective collisions and activation energy Animation Play

Effects of energy Slideshow Play

Effects of physical factors on the rate of photosynthesis Slideshow Play

Effects of the Sun on the Earth Whiteboard exercise Play

Efficiency Class activity Play

Efficiency Whiteboard presentation Play