
Day and Night Worksheet
A hands-on day and night worksheet where 3rd graders read Sun and Earth diagrams, finish science sentences from a word box, and explain what makes it dark. Answer key included for quick, no-prep review.
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About this resource
Description
Day and night follow a pattern that never stops. Earth is always spinning, and as it turns, sunlight can only reach the half of the planet that is facing the Sun. That lit half is having daytime, while the half turned away sits in darkness and has nighttime. This Day and Night Worksheet gives third graders a clear, hands-on way to see that pattern, read it off a diagram, and put it into their own words.
This 3rd grade earth science worksheet is built in three short parts that move from looking to thinking. In Part A, students study four Sun-and-Earth diagrams and decide whether the spot marked with an X is having day or night. In Part B, they pull words from a small word box to finish four science sentences about spinning, sunlight, daytime, and nighttime. In Part C, they write a full-sentence explanation of why it gets dark outside after dinner. Use it as a lesson warm-up, a science center activity, an exit ticket, or a homework review.
What’s Included
- 1 print-ready PDF worksheet
- Answer key
- 4 Sun-and-Earth diagram questions, 4 word-box sentences, and 1 written explanation
There are three reasons this Day and Night Worksheet helps students learn. First, the diagrams turn an invisible idea into something a child can actually point at, so the cause of day and night stops being a fact to memorize and becomes something to reason about. Second, the word box supports the vocabulary that shows up on science tests — sunlight, spins, daytime, and nighttime — without turning the page into a spelling task. Third, the written explanation asks students to connect a cause to an effect in their own words, which is exactly the kind of thinking that assessments reward.
Try a few of these ideas to extend the lesson at school or at home. Spin a globe next to a flashlight in a darkened room and let students find the spot that is having day. Track sunrise and sunset times for a week and talk about what changes. Have students draw one thing they do in the daytime and one thing they do at night, then label each picture with the reason the sky looks that way. Step outside at the same time each morning and trace a shadow with chalk to watch how the Sun’s light moves across the day.
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