Saguaro National Park receives about 10 inches of rain a year, but has some of the highest biodiversity in North American. Learn how plants and animals are adapted to a hot and dry environment.
Lesson 207
Science
3rd Grade, 4th Grade, 5th Grade, 6th Grade, 7th Grade, 8th Grade
Bridges are a natural part of human history and ingenuity and are as simple as crossing a fallen tree across [...]
Lesson 208
Learn about the layers that make up the earth and how they interact to affect the landscape. STEM Challenge: making [...]
Lesson 209
When objects are in physical contact with one another and rub together there is a molecular force that acts on [...]