The Sun and the Shadows Chapter Notes | Science for Grade 1 PDF Download

Introduction

The chapter "The Sun and the Shadows" introduces young learners to the importance of the sun and the concept of shadows. It explains how the sun, a massive star, provides heat and light essential for life on Earth. The chapter also explores how shadows are formed when objects block light and how their length changes throughout the day due to the sun's position. Through simple explanations and activities, students learn about the sun's role in nature and the fascinating behavior of shadows.

The Sun

• The sun is a huge ball of fire that gives heat and light.
• It is a star, much larger than Earth, but looks small because it is very far away.
• It rises in the east in the morning and sets in the west in the evening.
• The sun is very useful for many reasons:
  • Its heat turns water into vapor, helping form clouds.
  • Its light makes days bright and fresh.
  • It provides warmth during cold winter days.
  • It helps plants make food through sunlight.
  • It kills germs that cause diseases.
  • Its heat dries wet clothes.
  • It helps fruits on trees to ripen.
• Never look directly at the sun as it can harm your eyes.

Shadows

• A shadow is a dark shape formed when an object blocks light.
• Shadows appear on the side opposite to the light source.
• Shadows do not have color, even if you wear colorful clothes like red shorts or a blue shirt.
• In the past, people used shadows or sundials to guess the time before clocks existed.

Length of a Shadow

• The length of a shadow changes during the day based on the sun’s position.
• Shadows are longest in the morning and evening.
• Shadows are shortest at midday when the sun is directly overhead.