National Geographic Science - Spanish Sampler - Grade K
Issue link: http://www.e-digitaleditions.com/i/157323
Ciencias de la Tierra Gran idea Gran libro El día y la noche Pregunta sobre la gran idea ¿En qué se diferencian el día y la noche? SECTION 3 Lesson 7 Things in the Sky por Susan Halko Objective Science Students will be able to: • Explore the Law of Gravity by investigating how objects are pulled toward the ground unless something holds them up. 1 Introduce Tap Prior Knowledge Have students list objects we can see in the sky. Record the list. Encourage students to include familiar objects that they have not yet studied in this unit, such as clouds, birds, kites, and fireworks. Set the Purpose and Read Read the heading on page 22 aloud. Tell students to listen as you read to find out about other objects in the sky. 2 Teach Read Aloud and Discuss •Read pages 22–23 aloud. Then point to the photo of the kite on page 22. Have students discuss their experiences flying a kite. Encourage them to discuss how kites fly well sometimes and not well at other times. •Say: El clima ventoso es el mejor para volar una cometa. Then ask: ¿De qué manera el viento ayuda a que la cometa vuele? (The wind blows the kite up into the sky.) Explain that without wind, most kites would fall quickly to the ground. •Ask: ¿Una cometa se queda arriba todo el día o baja? (The kite comes down eventually.) Review other objects that can travel up into the sky, such as balls, birds, and airplanes. Lead the class to recognize that each of these objects eventually comes down to the ground. •Ask: ¿En qué se diferencian el Sol, la Luna y las estrellas de las cometas, las bolas y las aves? (Possible answer: The sun, moon, and stars appear only in the sky, never on the ground.) Discuss how the sun, moon, and stars are each very far away from Earth, much farther than even the clouds. T22 Big Ideas Big Book Raise Your SciQ! Gravity The force of gravity, as it is understood today, was first explained about 300 years ago by English scientist Isaac Newton. As Newton explained, gravity pulls any two objects toward one another. Netwon was the first to recognize that gravity explained the motions of both small and large objects. His concept of gravity explains why objects fall to Earth and why planets orbit the sun.