mine or national park? > From open-pit mines such as the one in the top picture, we get a useful and important metal---copper. But this kind of mine destroys both land and plants. The bottom...
The soil makers
Hundreds of millions of years ago, all the land was just bare, hard rock, sand, or clay. Now, soil covers most of the land. Where did the soil come from? Plants and weather made it. The first living...
The plants that conquered the land
Scientists think that the first living thing on land came out of the water about 500 million years ago. The sea was full of living things. There were jellyfish, sponges, worms, and small, crablike...
The first plants
> Long ago, the land was empty. All the plants and animals lived in the > water. > > They looked like tiny blobs of jelly. Many hundreds of millions of years ago, the world was a scary place!...
Plants of the grassland community
> Grasses and small plants with white or colored flowers are neighbors > in a grassland. or bushes grow on a grassland, but there are many small plants with white or colored flowers. Big herds of...
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