What is Population?
The number of people in a given place.
- Number of people in the classroom.
- Number of people at home.
- Number of people in a village.
- Number of people in a city.
- Number of people in a country.
- Number of people in the world.
In the early days there were a few people and they had so much space for them on Earth. Therefore the environments were not changed so much.
Nowadays people live and travel all over the world. Now the population or the number of people of the world is about 6 billion people. Rapid (fast) population growth uses up our natural resources and harms the environment and the environment is changed very quickly.
- Massive areas of land are cleared to grow food and to build new homes, shops factories and roads.
- People dig mines (pit) and quarries to get building stone, mineral and fuels.
- People harm the environment with noise and litter.
Have you ever seen a dinosaur? Have you ever seen a giant mammoth with huge tusks?
These animals once lived on Earth, but they all died out and now we cannot see them on Earth. We say they went extinct. Different kinds of animals have appeared and disappeared throughout Earth’s history. Dodo birds, dinosaurs, woolly mammoths are some of the extinct animals on Earth.
Why do animals go extinct?
- Due to the climatic changes.
- Some animals are unable to compete with other animals for food.
- Some animals are hunted or killed by enemies or predators for their meat, fur, skin or horns.
- Some animals are changing slowly from generation to generation. There can be small differences among parents, children and grandchildren. Finally, a different kind of animal evolves (develops or grows).
- Animals lose their homes when people clear land or fill in ponds for buildings.
We can still see blue whales, giant pandas, elephants, gorillas, koala bears and tigers on Earth. But these animals are in danger of becoming extinct. There are not many of them left on Earth. Blue whales, giant pandas, elephants, gorillas, koala bears and tigers are some of the endangered animals on Earth.
Why animals are in danger?
- Animals are poisoned by chemicals from farms and factories.
- Animals are killed by hunters for their meat, fur, skin or horns.
- People are destroying habitats of animals to build farms, roads and towns.
Not only animals there are also many valuable plants which have become endangered.
A habitat is a place where an animal normally lives. Forests, deserts, and wetlands are kinds of habitats.
How can you make your school ground more interesting by encouraging wildlife?
- If your school does not have any space for a garden, you could plant flowers in tubs or inside old car or lorry tyres filled with soil or compost.
- You could make nest boxes for birds and squirrels.
- You could make a bird table where the birds and squirrels can feed.
- You could grow plants with flowers that butterflies and bees like to feed on.
- You could make a small pond which attracts frogs, toads and other animals that like water.