
Light caused by people is called artificial light. Artificial light that is not needed is called light pollution. Light pollution makes it hard to see the stars.
Photo Credit: Everlock/Getty Images
We also learn by listening. We listen with our whole … read more
Some mummies are very old. Scientists can learn from mummies. … read more
Penguins live right by the water. They usually live where … read more
© 2025 McGraw-Hill Education. All Rights Reserved.