CK-12 Foundation
Hot Air Balloon
How can people control a hot air balloon? The simple simulation allows scholars to adjust the payload mass, burner, and vent position on a hot air balloon and observe the changes in velocity and altitude over time. Challenge questions...
Curated OER
English Exercises: Cloze Exercise
In this online interactive English worksheet, students respond to 29 fill in the blank questions where they complete a cloze activity. Students may submit their answers to be scored.