Leaves Changing Colors
Every fall, the leaves on some trees turn different colors. Leaves are green in the spring...
Fossils are the remains of animals and plants. These animals and plants lived on Earth many years ago. Fossils are found in rocks, coal, tar, and ice. Water and mud help form fossils. They form a seal around the ancient animals. Only the hard parts of animals become fossils. The most common types are bones and teeth. Some fossils show footprints. There are even fossils of leaves and nests. Scientists use fossils to learn about dinosaurs. Dinosaurs lived millions of years ago. Fossils can tell us what animals looked like. But fossils do not tell us everything. They do not tell us how animals acted or sounded. Fossils are very rare. Scientists have to dig to find fossils. They are always looking for new clues to Earth's history. Dinosaur fossils have been found around the world.
Every fall, the leaves on some trees turn different colors. Leaves are green in the spring...
Scientists recently held an out of this world discussion. What was their mission? Define w...
Snow can be fun to play in. When it snows, you can go sledding. You can also make snowball...