How do sedimentary rocks form?

Layers of sediment are compressed and cemented

Limestone is mainly made of what?

Calcium carbonate, often from shells

Rock Types Knowledge Quiz – Test the Details

This rock types knowledge quiz covers igneous, sedimentary and metamorphic rocks, examples like granite, basalt, sandstone, limestone, marble and slate, and how each type forms. Ten questions test the details of the rocks that make up Earth.

Start Rock Types Knowledge Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Types
What are the three main rock types?
Igneous
How do igneous rocks form?
Granite
Granite is which type of rock?
Basalt
Which igneous rock forms most of the ocean floor?
Sedimentary
How do sedimentary rocks form?
Limestone
Limestone is mainly made of what?
Marble
Marble forms from which rock?
Slate
Slate forms from which rock?
Floats
Which volcanic rock can float on water?
Glass
Which volcanic glass forms when lava cools very quickly?

Explanations: answer key for all 10 questions

Q1: What are the three main rock types?
Answer: Igneous, sedimentary and metamorphic
Each forms differently.
Q2: How do igneous rocks form?
Answer: From cooled magma or lava
The name means from fire.
Q3: Granite is which type of rock?
Answer: Igneous
It cools slowly underground, forming large crystals.
Q4: Which igneous rock forms most of the ocean floor?
Answer: Basalt
It cools quickly from lava.
Q5: How do sedimentary rocks form?
Answer: Layers of sediment are compressed and cemented
They often contain fossils.
Q6: Limestone is mainly made of what?
Answer: Calcium carbonate, often from shells
Chalk is a type of limestone.
Q7: Marble forms from which rock?
Answer: Limestone
Heat and pressure recrystallize it.
Q8: Slate forms from which rock?
Answer: Shale
It splits into thin sheets.
Q9: Which volcanic rock can float on water?
Answer: Pumice
It is full of gas bubbles.
Q10: Which volcanic glass forms when lava cools very quickly?
Answer: Obsidian
It breaks with very sharp edges.

Rock Types Knowledge Quiz – The Stuff of Earth

Rocks are classified into three main types based on how they form. Igneous rocks crystallize from molten magma or lava, sedimentary rocks build up from layers of sediment and metamorphic rocks form when existing rocks are changed by heat and pressure.

Each type has familiar examples. Granite and basalt are igneous, sandstone, limestone and shale are sedimentary and marble, slate and gneiss are metamorphic. Sedimentary rocks are where most fossils are found.

Rocks are used in buildings, roads, sculptures and tools. Studying them reveals Earth's history, from ancient volcanoes to vanished seas, and the rock cycle shows how rocks constantly change from one type to another over millions of years.

What This Quiz Teaches

This quiz is for students learning rock types.

What the three types are
How igneous rocks form
Which rocks have fossils
What marble comes from
Which rock floats

Did You Know?

The White Cliffs of Dover are chalk.
Michelangelo's David is carved from marble.
Sandstone forms from sand grains.
Coal is a sedimentary rock.
Earth's oldest rocks are about 4 billion years old.