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Waterfalls form mainly in the upper course of rivers, usually in rocky areas, due to vertical erosion.


A popular crop of ploughlands. Its oil is widely used in cookery and has well known medicinal properties.

Studying adsorption

Purifying a solution coloured with fuchsine dye with finely ground activated carbon granules and a filter.

Sound localisation

Sound localisation is an important element in orientation. A sound reaches the ear closest to it first.

Stenotopic species

Certain species can only be found in one or two regions on Earth, as they would be unable to tolerate any drastic environmental changes. These are called...


The long, narrow sea inlets created by glacial erosion are called fjords. Most fjords can be found along the coasts of Norway and Iceland.

Dehydration of sugar with sulphuric acid

In this experiment we make beet sugar, that is saccharose, react with sulphuric acid.


Winter is one of the seasons of the temperate climate zone. Days are the shortest and the weather is the coldest in winter.


Norway is one of the countries of Scandinavia in northern Europe with a coastline laced with fjords. The capital city is Oslo.


Dragonflies are aquatic in their larval stage. They are predator insects, easily recognisable by their two pairs of transparent wings.


Spring is one of the seasons of the temperate climate zone. Nature comes to life, flowers start blooming and the woods and meadows turn green again.

The fig tree

Learn about the fig tree and its extraordinary fruit and find out about its medicinal properties as well..


Since solar radiation is not evenly absorbed, the Earth's surface is heated differently. The resulting differences in atmospheric pressure cause the...

Eurytopic species

Certain species spread out over a large area, almost throughout the globe. They are unaffected by changes in the environment; they are called eurytopic species.


Living organisms have different reactions to changes in the environment. We differentiate between stenotopic and eurytopic species accordingly.

The change in respiratory rate during exercise

Through mild physical exercise, even a trained body doubles the number of breaths it takes within a set amount of time.

Pond slider

A popular pet of children. They can be easily recognised by the red patches behind their eyes.


The seven-spot ladybird is probably the best-known of all the ladybirds. Its conspicuous pattern warns predators of the bug’s unpleasant taste.

The story of Moses

This is the story of the birth and deeds of the biblical prophet, Moses.

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