Geologic Time and Fossils

Space left behind by a decayed organism that mirrors its outward shape

Fossils only found in certain layers of the Earth's crust that can date their surroundings

The eon when the Earth had first formed and was still too hot for oceans or an atmosphere

What is an example of evidence that a giant asteroid collided with the Earth?

The layers of rock on the Earth's surface are mostly made of

The continents were once believed to be connected together in one giant landmass called

During what time span did most of the dinosaurs live?

The fossils of organisms that are known to have existed only in a specific time period

What type of rock do fossils form in?

Which type of rock is not sedimentary?

The Principle of Superposition states that the oldest rock layers are found

What is believed to have caused the mass extinction of the dinosaurs 65 million years ago?

According to scientists, what is the estimated age of the Earth?

The removal and relocation of rocks and soil from their original location

Which statement best describes the theory of Uniformitarianism:

The earliest forms of life were most likely

Radioactive dating works with rocks because they contain

Ice cores contain air bubbles that can give this information about the Earth's past

Which bit of evidence could indicate a year that had very little rainfall?

Minerals from water replace animal tissues and harden in a process called

The breaking of rock and other materials of the Earth's surface into smaller pieces

Fossil formed after a living thing leaves an impression in mud or sand like a footprint or poop

Fossil formed when the space left by a decayed organism is filled in with hardened minerals

What type of fossil would best show the complete outline of a plant leaf?