Types of Rocks: Quiz | Worksheet - Free Printable

Let’s go step by step to match each rock attribute to the correct rock type.

We have three main types of rocks:
- Sedimentary – made from layers of sand, mud, or pebbles pressed together over time.
- Metamorphic – changed by heat and pressure; often have ribbon-like layers or shiny surfaces.
- Igneous – formed from cooled lava or magma; can be glassy, sparkly, or have holes (like Swiss cheese).

Now let’s look at each clue:

1. “These rocks have small, shiny, or sparkly crystals.”
→ This sounds like igneous rocks — when lava cools quickly, it can form tiny crystals that sparkle.

2. “These rocks have fossils or imprints of leaves, shells, or insects.”
→ Only sedimentary rocks trap fossils because they form in layers where dead things get buried.

3. “Some of these rocks may have holes like swiss cheese.”
→ That’s igneous too! When gas bubbles are trapped in cooling lava, it makes holes (like pumice).

4. “Some of these rocks are not rough but smooth and shiny like glass.”
→ Again, igneous — obsidian is a volcanic glass that’s super smooth and shiny.

5. “These rocks have ribbon like layers.”
→ Metamorphic rocks get squished and stretched under pressure, making wavy or ribbon-like bands.

6. “In these rocks you may see individual stones, pebbles or sand grains.”
→ Sedimentary rocks are made of bits of other rocks stuck together — so you can still see the original pieces.

Now let’s assign them:

✔ Igneous:
- Small, shiny/sparkly crystals
- Holes like swiss cheese
- Smooth and shiny like glass

✔ Sedimentary:
- Fossils or imprints
- See individual stones/pebbles/sand grains

✔ Metamorphic:
- Ribbon-like layers

Final Answer:
Match as follows:

- “small, shiny, or sparkly crystals” → Igneous
- “fossils or imprints of leaves, shells, or insects” → Sedimentary
- “holes like swiss cheese” → Igneous
- “smooth and shiny like glass” → Igneous
- “ribbon like layers” → Metamorphic
- “individual stones, pebbles or sand grains” → Sedimentary