Types of Rocks: Igneous (Part 2)

What You'll Learn

Sedimentary rocks form in layers, with the oldest layers at the bottom. Geologists use these layers to determine the relative age of rocks and the fossils they contain.

Key Words

weathering
sediment
fossil

Materials Needed

cotton balls
food coloring
clear container

Safety First

Adult supervision recommended.
Do not taste any materials.
Wear safety goggles when mixing liquids.

Steps

Step 1 — Read

Read and learn: Sedimentary rocks form in layers, with the oldest layers at the bottom. Geologists use these layers to determine the relative age of rocks and the fossils they contain.

Step 2 — Do

Create a labeled diagram of what you built or observed.

Step 3 — Observe

Draw a picture of what you observe.

Step 4 — Record

Answer the questions based on your data.

Check Your Understanding

Question 1

1 of 3

What are the three types of rocks?