What did people first use to send messages along the Great Wall of China?

• drums

• computers

• telephones

How did phones change over time to make communication better?

• The phones got bigger.

• The sound got better.

• It took more time to make a phone call.

Which 2 words describe volume?

• loud and soft

• light and dark

• high and low

Tags

NGSS.MS-PS4-1

Which 2 words describe pitch?

• loud and soft

• hot and cold

• high and low

Which sound has a high pitch?

• bang

• crunch

• squeak

Name a high pitched noise.

Tags

NGSS.MS-PS4-1

Name a low pitched noise.

Tags

NGSS.MS-PS4-1