At the centre of the stratosphere, 10-50 kilometres above the Earth, lies the vital ozone layer. It is made by the sun’s light constantly converting some of the oxygen in the air into ozone [1]. Ozone consists of three oxygen …
Ozone Layer
Knowledge
Food Cycle
A food cycle consists of several food chains that intertwine and influence each other in an ecosystem. An organism often has several types of food and is, in turn, eaten by different species, which means that nutrients are spread and …
Food Chain
A food chain shows how organisms are interdependent in an ecosystem [1]. In other words, nutrients are dispersed and transformed through a chain of organisms that eat or are eaten by each other [2].
A food chain always starts with …
Lithosphere
The Earth is divided into different layers, with the lithosphere being the solid surface, i.e. the crust and the upper part of the mantle, extending to a depth of about 100-150 kilometres [1].
The Earth’s crust is divided into seven …
Biogeochemical Cycle
The biogeochemical cycle refers to the circulation of an element (e.g. carbon and nitrogen) or chemical compound (e.g. water) as it travels through different parts of an ecosystem. During its journey through nature, it is affected by living and …
Soil
Tellus or terra is Latin for soil or earth. So, the planet has the same name as the soil or earth in which we cultivate our food and all plants, emphasising the importance of healthy soil for the well-being of …
