Earth Science Quiz: Rocks, Plates, Oceans and the Atmosphere

This earth science quiz explores our planet from the inside out, from the crust and core to Alfred Wegener's drifting continents, Pangaea, igneous rock, seismographs, the stratosphere and the Challenger Deep. Ten questions, 90 seconds.

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🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 90 Seconds

Question 1 / 10 Time: 90s

Structure
What is the outermost layer of the Earth called?
Plate Tectonics
Who proposed the theory of continental drift in 1912?
Rocks
Which type of rock forms when magma or lava cools and hardens?
Earthquakes
Which instrument records the shaking of earthquakes?
Plate Tectonics
What was the name of the supercontinent that existed about 300 million years ago?
Atmosphere
Which layer of the atmosphere contains the ozone layer?
Oceans
What is the deepest known point in the ocean?
Structure
What is Earth's inner core mainly made of?
Volcanoes
Which gas makes up most of what volcanoes release?
Time
Approximately how old is Earth?

Explanations: answer key for all 10 questions

Q1: What is the outermost layer of the Earth called?
Answer: Crust
The crust is the thin rocky shell we live on, from about 5 kilometers thick under the oceans to about 70 kilometers under big mountain ranges. Below it lies the much thicker mantle.
Q2: Who proposed the theory of continental drift in 1912?
Answer: Alfred Wegener
German scientist Alfred Wegener noticed that coastlines like South America and Africa fit together like puzzle pieces. His idea was rejected for decades until plate tectonics explained it in the 1960s.
Q3: Which type of rock forms when magma or lava cools and hardens?
Answer: Igneous
Granite and basalt are igneous rocks. Sedimentary rocks form from layers of sediment, and metamorphic rocks form when heat and pressure change existing rock.
Q4: Which instrument records the shaking of earthquakes?
Answer: Seismograph
A seismograph records ground motion as wavy lines. Scientists use readings from many stations to find where an earthquake started and how strong it was.
Q5: What was the name of the supercontinent that existed about 300 million years ago?
Answer: Pangaea
Pangaea means all lands in Greek. It began breaking apart about 200 million years ago, first into Laurasia in the north and Gondwana in the south.
Q6: Which layer of the atmosphere contains the ozone layer?
Answer: Stratosphere
The ozone layer sits in the stratosphere, about 15 to 35 kilometers up, and absorbs most of the Sun's harmful ultraviolet light. Weather happens in the troposphere below.
Q7: What is the deepest known point in the ocean?
Answer: Challenger Deep
The Challenger Deep in the Mariana Trench is nearly 11,000 meters deep. If Mount Everest were placed at the bottom, its peak would still be more than 2 kilometers underwater.
Q8: What is Earth's inner core mainly made of?
Answer: Iron and nickel
The inner core is a solid ball of iron and nickel about as hot as the surface of the Sun. It stays solid because of the enormous pressure at the center of the Earth.
Q9: Which gas makes up most of what volcanoes release?
Answer: Water vapor
Water vapor is usually the main volcanic gas, followed by carbon dioxide and sulfur dioxide. Large eruptions can cool the climate when sulfur gases reach the stratosphere.
Q10: Approximately how old is Earth?
Answer: 4.5 billion years
Earth formed about 4.54 billion years ago, based on the dating of meteorites and the oldest rocks. The universe itself is about 13.8 billion years old.

Earth Science Quiz – How Our Planet Works

Earth science is the study of our planet: its rocks, oceans, atmosphere and the forces that shape them. It explains why earthquakes strike, why volcanoes erupt, how mountains rise and how weather forms. It also helps us understand natural resources, from fresh water to minerals, and how human activity is changing the planet.

Beneath our feet, Earth is built in layers. A thin crust floats on a hot, slowly moving mantle, which surrounds a liquid outer core and a solid inner core of iron and nickel. Heat from deep inside the Earth drives the movement of tectonic plates, the giant slabs of crust that carry the continents.

The idea that continents move was first proposed by Alfred Wegener in 1912, but it took until the 1960s for scientists to accept it. Today plate tectonics explains why the Himalayas are still rising, why Japan and Chile have so many earthquakes and why the Atlantic Ocean grows a little wider every year.

Above us, the atmosphere is just as active. Weather happens in the lowest layer, the troposphere, while the ozone layer higher up protects life from harmful ultraviolet light. The oceans, which hold about 97 percent of Earth's water, move heat around the globe and help control the climate.

This quiz covers Earth's structure, rocks, plates, oceans and atmosphere, with clear explanations for every answer.

What This Quiz Teaches

This quiz suits geography and science students, hikers, rock collectors and anyone curious about the planet.

What Earth's layers are made of
How Alfred Wegener's idea became plate tectonics
How igneous, sedimentary and metamorphic rocks form
How earthquakes are measured
Where the ozone layer is found
How old Earth is and how we know

Quick Facts About Earth Science

The Himalayas grow a few millimeters taller each year.
There are about 1,350 potentially active volcanoes on land around the world.
The Pacific Ring of Fire is home to around 75 percent of the world's active volcanoes.
The largest earthquake ever recorded struck Chile in 1960, with a magnitude of 9.5.
Earth's magnetic field has reversed many times over its history.
Only about 3 percent of Earth's water is fresh water.