
This map shows a day when the air quality was bad. See the area in red? That shows unhealthy air quality. Wildfires in Quebec, Canada made the air unhealthy.
Photo Credit: AirNow/U.S. Environmental Protection Agency
The International Space Station is a science lab in space. … read more
Denver needed water. They built a dam. It created a … read more
The Sun gives us heat and light. When the Sun … read more
© 2025 McGraw-Hill Education. All Rights Reserved.