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What Do You Know About Earth?

Test your knowledge about our planet by taking this quiz!

1

Which type of rock forms from melted rock deep within Earth ?

surface of sandstone

sedimentary

surface of gneiss with wavy striations

metamorphic

surface of the rock dacite

igneous

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surface of the rock dacite
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ANSWER: igneous

There are two kinds of igneous rocks . Some are extrusive, which means they are formed from magma that erupted from a volcano. Some are intrusive, which means that they are formed from magma underground. Igneous rocks, like all rocks, can give us clues about the history of the Earth.

Question 1 of 10
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2

Where are most volcanoes in the world located?

 

Australia

 

underwater

 

Indonesia

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ANSWER: underwater

About 90 percent of all the volcanoes that erupt on Earth each year occur at the bottom of the ocean where plates are spreading apart. Magma from Earth's upper mantle rises up to fill the cracks that occur when plates separate. While these volcanoes don't explode like some volcanoes on land, they are constantly erupting.

Question 2 of 10
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satellite view of Earth with major tectonic plate lines delineated in red and names of major plates
3

Earth's thin, outer shell is broken up into big pieces called tectonic plates . What happens along plate boundaries?

 

hot spots

 

tornadoes

 

volcanoes and earthquakes

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ANSWER: volcanoes and earthquakes

Volcanic eruptions and earthquakes tend to occur along plate boundaries. Volcanoes form and erupt when one plate subducts, or sinks below another, or where plates are spreading apart. Earthquakes occur along all types of plate boundaries — anytime plates grind together and pressure builds up.

Question 3 of 10
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4

Rocks have stories to tell. They can tell us:

 

how a mountain was formed

 

what the climate used to be like

 

both A and B

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ANSWER: both A and B

Rocks hold important clues about our planet. They can tell us about remote places that we can't go to and about distant times in the past. Scientists study rocks to learn about the history of Earth.

Question 4 of 10
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many grey rocks
5

Almost all rocks are made of:

 

glass

 

minerals

 

sand

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ANSWER: minerals

Rocks differ in part because they contain different types and amounts of minerals. You can identify rocks by the kinds of minerals present, their shape and size, and their quantity.

Question 5 of 10
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6

Rocks can by collected:

 

by anyone

 

only by geologists

 

only in the United States

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ANSWER: by anyone

Rocks can be collected by anyone. You don't need to be an expert. Remember to always have an adult with you and don't go on private property.

Question 6 of 10
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fossilized brachiopods in limestone rock
7

Fossils are the remains of ancient plants and animals. Fossils are found in which type of rock?

 

igneous

 

metamorphic

 

sedimentary

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ANSWER: sedimentary

Sedimentary rocks are mostly formed from layers of sand, silt, dead plants, and animal skeletons. These rocks are like time capsules. They can show you what life was like at different times. Generally, as you dig deeper into sedimentary rocks, you are going back in time.

Question 7 of 10
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cross-section of Earth diagram with crust, mantle, outer core, inner core and atmosphere pointed to
8

The heat that moves the tectonic plates comes from:

 

Earth's mantle and core

 

Earth's crust

 

Earth's atmosphere

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ANSWER: Earth's mantle and core

The natural radioactive decay of elements in the mantle produces heat. Plus, Earth's core is hotter than the surface of the Sun. The heat from the core and mantle together is the driving force that makes the mantle flow. It flows very, very slowly, but it's enough to cause the plates to move over long periods of time.

Question 8 of 10
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Earth, the blue marble, as seen from space
9

How old is our planet Earth?

 

4.5 billion years old

 

2 million years old

 

3,000 years old

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ANSWER: 4.5 billion years old

Earth, the Sun , and all the planets in our solar system formed at the same time, about 4.5 billion years ago. The solar system started with a cloud of dust and gas called a solar nebula. Over time, the dust formed rocks, and eventually planets.

Question 9 of 10
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10

What is the Pacific Ring of Fire?

 

the longest fire in history

 

a chain of over 500 active volcanoes

 

a circle of volcanoes that erupt at the same time each year

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ANSWER: a chain of over 500 active volcanoes

The Pacific Plate is subducting under several other plates. This movement forms a long chain of volcanoes called the Ring of Fire . It stretches from New Zealand, along the eastern edge of Asia, north across the Aleutian Islands of Alaska, and south along the western coast of North and South America. These are some of the most explosive volcanoes in the world.

Question 10 of 10
Nice try! Not bad! You rock! A rock solid score! You got out of 10 right on the first guess.
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