
How do we know about ice ages? Scientists study ice. Scientists study clues from glaciers. Scientists study fossils.
What Do You Think? How did humans live during the ice age?
Photo Credit: Corbin17/Alamy Stock Photo
Summer is here! The weather is warm. Here are some … read more
We learn by doing. Work with your classmates. Listen to … read more
What question is this scientist asking? Maybe she wants to know … read more
© 2025 McGraw-Hill Education. All Rights Reserved.