Light and Sound - Grade 4 Science

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FREQUENCYWHEKCEYBBMS IFMLNFBMNATURALNHJNO EJVPITCHBCSVEOBOFOOU KQYIZSXEJSSNNDEIJAIN TOLTBXHJYMEXQHXTIETD NPRRARCWXENYVEYCMVUC EAUABKADKLDXPYPAXRLS RQYNSFYTCEUCFEMRSELT AUOSOTKEIOOLQSOFNNOR PEQLRISCFOLKIMQEOCPE SCLUPMIWZKNYEGLRIITF NHACTEEJSIJQXNHDTTHL AAIEIRVKYVUJZXLTAPGE RVCNOXDAKYTGBSJNCOIC TXITNDLWHXNLGPUWOWLT XOFLIGHTWAVESYHXLABI QBISWQCAUDLFHZVIOPPO LSTJSHADOWTBRZYCHSMN EDRVKGRXTLHILFEYCUJU LTAFDROBZVXYLIROEUKN
1.
light
2.
sound
3.
natural
4.
artificial
5.
loudness
6.
vibration
7.
echolocation
8.
eyes
9.
opticnerve
10.
lightpollution
11.
lightwaves
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reflection
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absorption
14.
refraction
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transparent
16.
translucent
17.
opaque
18.
shadow
19.
emit
20.
frequency
21.
pitch