1. launch (v)
The hot-air balloons were launched into the sky. Definition: to send or shoot

2. inflate (v)
Billy asked me to inflate the balloon. Definition: to add air or gas to (something, such as a tire or a balloon) and make it larger Antonym: deflate

3. companion (n) My mom was my traveling companion when I toured Mexico.
Definition:
a person or animal to keep someone company

4. anchor (v) We anchored the boat and began to look for whales.
Definition:
to prevent a vessel from moving

5. scientific (adj)
We used the scientific method to prove that air has weight.
Definition:
relating to science

6. particle (n) The scientists looked at particles under the microscope.
Definition:
a very small piece of something

7. dense (adj) The fog was so dense that school was delayed. Definition:
having parts that are close together; heavy

8. hydrogen (n) Water is made of hydrogen and oxygen. Definition:
a light gas that burns easily; it’s a chemical element that has no color or smell