Students should have some fluency with: shadows occur in nature when sunlight is blocked by an object night and day are cause by the rotation of the Earth sequences of natural events (day and night, seasonal 
(shadows; occur; L:in nature; T:when sunlight is blocked by an object night and day) (sunlight; is blocked; by an object night and day)
shadows sunlight
occur is blocked
L:in nature T:when sunlight is blocked by an object night and day
by an object night and day