What type of fossil is a trilobite?
An extinct insect-like sea animal
A dinosaur fossil
A fossil from 10 years ago
A plant fossil
How old do scientists think Earth is?
500 million years
100 million years
1 million years
4 billion years
What do scientists study to learn about Earth's past?
Clouds
Fossils
Stars
Planets
How long ago did trilobites live?
4 billion years ago
250 to 520 million years ago
65 million years ago
10 million years ago
How do scientists know when dinosaurs disappeared?
They study dinosaur fossils in rocks between 65 and 130 mill
They read about it in books.
They look at the weather.
They use a telescope to look into the past.
What are marker fossils?
Fossils of animals that are still alive
Fossils used to figure out the age of rocks and other fossil
Fossils that glow in the dark
Fossils found only in water
What do the layers of rock help scientists understand?
The future of Earth
Where dinosaurs live today
The temperature of the Earth
What Earth was like long ago
Why is it important for scientists to study fossils?
Fossils tell us about plants and animals from long ago.
Fossils help us find gold and silver.
Fossils make good decorations.
Fossils are pretty.
Why are trilobites helpful to scientists?
They were the first animals on Earth.
They are still alive today.
They tell scientists the age of other fossils.
They were bigger than dinosaurs.
Why do you think not every plant or animal became a fossil?
They were not preserved in the right conditions.
They disappeared too quickly.
Fossils can only form in water.
They were too big.