An ecosystem is a living community of plant and animals sharing an environment with non-living elements such as climate and soil.
Ecosystems exist on a variety of scales. An example of a small scale ecosystem (micro) is a pond. A medium scale ecosystem (messo) could be a forest. The tropical rainforest is an example of a very large ecosystem (biome).
Sunlight is the main source of energy. This allows plants to convert energy by photosynthesis. This provides food for some animals, birds and fish. These are called Herbivores. The other animals eat the animals that have eaten the plants. These are Carnivores. This process is called the FOOD CHAIN.
The World has many different ecosystems. Each one has its own climate, soil, plants and animals. Very few ecosystems are natural today because of human activities. More ecosystems are under threat than ever before and need protecting.
[Online activities]: n Activities related to this topic Ecosystems - Half a Minute Game
Ecosystems - Interactive Diagram
Ecosystems - Fling the teacher Podcast
[Podcast]: n Audio file for playback on mobile devices and personal computers
After showing early signs of recovery beginning in the spring of 1933, the economy continued to improve throughout the next three years, during which real GDP (adjusted for inflation) grew at an average rate of 9 percent per year. A sharp recession hit in 1937, caused in part by the Federal Reserve’s decision to increase its requirements for money in reserve. Though the economy began improving again in 1938, this second severe contraction reversed many of the gains in production and employment and prolonged the effects of the Great Depression through the end of the decade.
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