Science olympiad grade 3 Worksheet-7

Science olympiad grade 3 Worksheet-7

49. Which kind of soil has the most humus?

(A) red clay soil                             (B) sandy pond soil

(C) dark forest soil                       (D) bedrock

50. What kind of soil holds the most water?

(A) sandy soil    (B) clay              (C) rocks            (D) plants

51. A teacher speaking is the sound source, and students listening with their ears are sound receivers.

(A) True             (B) False

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52. Which of the following sound sources would produce the HIGHEST PITCH?

(A) phone          (B) whistle         (C) truck horn  (D) growling dog

53. What is oxygen?

(A) A gas            (B) A liquid       (C) A solid

54. Which layer of soil has the most humus?

(A) topsoil         (B) subsoil         (C) bedrock       (D) clay

55. What is the top layer of soil called?

(A) topsoil         (B) subsoil         (C) bedrock       (D) humus

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56. When a living thing dies it DECOMPOSES and rots away. What does DECOMPOSE mean?

(A) to grow bigger                        (B) to break down

(C) to survive                                 (D) to study closely

Answer Keys

(49)–C; (50)–B; (51)–A; (52)–B; (53)–A; (54)–A; (55)–A; (56)–B