Which kind of soil has the most humus?
(A) red clay soil (B) sandy pond soil
(C) dark forest soil (D) bedrock
What kind of soil holds the most water?
(A) sandy soil (B) clay (C) rocks (D) plants
A teacher speaking is the sound source, and students listening with their ears are sound receivers.
(A) True (B) False
Try more science olympiad worksheets
Which of the following sound sources would produce the HIGHEST PITCH?
(A) phone (B) whistle (C) truck horn (D) growling dog
(49)–C; (50)–B; (51)–A; (52)–B