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Instantly access over 40,000 of the best books & videos for kids on Epic

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Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

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Read Space Detectives: The Inner Planets on Epic

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Read Space Detectives: The Inner Planets on Epic

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Instantly access Space Detectives: The Inner Planets plus over 40,000 of the best books & videos for kids.

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https://www.getepic.com/app/read/78715

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Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.description
Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.description
Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

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Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

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https://www.getepic.com/app/read/32043

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Instantly access over 40,000 of the best books & videos for kids on Epic

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https://www.getepic.com/app/read/54252

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

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Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

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Copyright © 1996-2015 National Geographic SocietyCopyright © 2015-2026 National Geographic Partners, LLC. All rights reserved

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Species | Protecting Wildlife | World Wildlife Fund

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World Wildlife Fund is committed to endangered species protection. See how we are ensuring that the world our children inherit will be home to the same species we enjoy today.

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Instantly access Electricity: First Science plus over 40,000 of the best books & videos for kids.

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Instantly access over 40,000 of the best books & videos for kids on Epic

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Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

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instant access to thousands of great kids books.

# data[].attributes.attachment_link.title
Instantly access 40,000 high-quality books for kids

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The leading digital library for kids offering unlimited access to 40,000 of the best children's books of all time. Sign up for a free 30 day trial to instantly access high-quality online books for kids, ebooks, audio books, quizzes, videos, and more.

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instant access to thousands of great kids books.

# data[].attributes.attachment_link.title
Instantly access 40,000 high-quality books for kids

# data[].attributes.attachment_link.description
The leading digital library for kids offering unlimited access to 40,000 of the best children's books of all time. Sign up for a free 30 day trial to instantly access high-quality online books for kids, ebooks, audio books, quizzes, videos, and more.

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.description
Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.description
Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

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Electricity is the flow of tiny particles called electrons and protons. It can also mean the energy you get when electrons flow from place to place. Electricity can be seen…

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Instantly access over 40,000 of the best books & videos for kids on Epic

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Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

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Read Forces and Motion Through Infographics on Epic

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Read Forces and Motion Through Infographics on Epic

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Instantly access Forces and Motion Through Infographics plus over 40,000 of the best books & videos for kids.

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instant access to thousands of great kids books.

# data[].attributes.attachment_link.title
Instantly access 40,000 high-quality books for kids

# data[].attributes.attachment_link.description
The leading digital library for kids offering unlimited access to 40,000 of the best children's books of all time. Sign up for a free 30 day trial to instantly access high-quality online books for kids, ebooks, audio books, quizzes, videos, and more.

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.description
Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.description
Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

# data[].attributes.attachment_link.readable_text
When we say that something is in motion, we usually mean that it is moving. But motion has a special meaning in science. In science, motion is a change in position compared to a place or an object that is not moving. The place or object that is not moving is called the frame of reference.

Motion is a kind of puzzle because every object in the universe is in motion. This means that no frame of reference is correct in every situation. For example, a car is in motion when the ground is the frame of reference. In this situation, we think of the ground as not moving. But the ground, a part of Earth, is in motion when the Sun is used as the frame of reference. This is because Earth travels around the Sun.

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When we say that something is in motion, we usually mean that it is moving. But motion has a special meaning in science. In science, motion is a change in position compared to a place or an object that is not moving. The place or object that is not moving is called the frame of reference.

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instant access to thousands of great kids books.

# data[].attributes.attachment_link.title
Instantly access 40,000 high-quality books for kids

# data[].attributes.attachment_link.description
The leading digital library for kids offering unlimited access to 40,000 of the best children's books of all time. Sign up for a free 30 day trial to instantly access high-quality online books for kids, ebooks, audio books, quizzes, videos, and more.

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.description
Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

# data[].attributes.attachment_link.keywords[]
instant access to thousands of great kids books.

# data[].attributes.attachment_link.title
Instantly access 40,000 high-quality books for kids

# data[].attributes.attachment_link.description
The leading digital library for kids offering unlimited access to 40,000 of the best children's books of all time. Sign up for a free 30 day trial to instantly access high-quality online books for kids, ebooks, audio books, quizzes, videos, and more.

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.description
Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

# data[].attributes.attachment_link.keywords[]
instant access to thousands of great kids books.

# data[].attributes.attachment_link.title
Instantly access 40,000 high-quality books for kids

# data[].attributes.attachment_link.description
The leading digital library for kids offering unlimited access to 40,000 of the best children's books of all time. Sign up for a free 30 day trial to instantly access high-quality online books for kids, ebooks, audio books, quizzes, videos, and more.

# data[].attributes.attachment_link.title
Instantly access over 40,000 of the best books & videos for kids on Epic

# data[].attributes.attachment_link.description
Get unlimited access to 40,000 of the best books, audiobooks, videos, & more for kids 12 and under. Try it free.

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Weather facts, photos, videos, and experiments

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Weather facts, photos, videos, and experiments

# data[].attributes.attachment_link.description
Weather is a specific event-like a rainstorm or hot day-that happens over a few hours, days or weeks. Climate is the average weather conditions in a place over 30 years or more. NASA has observed that Earth's climate is getting warmer.