Key Vocabulary light Light is the energy that makes it possible to see things. dark Dark means with no or very little light. shadow A shadow is the dark place made when an object blocks light. Casts a shadow. streetlight A streetlight is a lamp on the street. pass Pass means to go through. light pass through prism. sunglasses Sunglasses are dark glasses that protect your eyes from the Sun. ...

Key Vocabulary heat Heat is a kind of energy that make things hot. energy Energy is power that makes things work or cause change. warm Warm means to make something hot. rub Rub means to move two things together quickly. stove A stove is apiece of kitchen equipment that cooks food using heat. lamp A lamp is a device that uses electricity to produce light. Visual Summary Heat Sources Source picture sun fire light rubbing hands Exercise Match each word with its definition: ...

Key Vocabulary star A star is a bright object in the sky that makes its own light. sun The Sun is the star closest to the Earth. The Sun gives us light and warmth. moon The moon is the round object that moves around the Earth. planet A planet is an object that moves around the Sun. rotate Rotate means to spin. Day and night happen when the Earth rotates. clockwise. counterclockwise. ...

Key Vocabulary season A season is any of the four main periods of the year. spring Spring is the season between winter and summer. flowers bloom. spring/jump out. summer Summer is the warmest season of the year. It comes after spring. fall Fall is the season between summer and winter. many plants bear fruit. harvest. winter Winter is the clodest season of the year. It comes after fall. daylight Daylight is the light that comes from the sun during the day. ...

Key Vocabulary cycle A cycle is a series of events being repeated many times. cloud A cloud is many drops of water that are together in the sky. evaporate Evaporate means to change from water to water vapor. condense Condense means to change from water vapor to water drops. water vapor Water vapor is the water that goes up into the air as a gas. drop A drop is a small amount of water. ...

Key Vocabulary measure Measure means to find the size, speed, or amount of something using a tool. How big it is? How fast is it? How much is there? temperature Temperature is how warm or cool something is. thermometer A thermometer is a tool used to measure the temperature. rain gauge A rain gauge is a tool used to measure how much rain has fallen. wind vane A wind vane is a tool used to measure the direction the wind is blowing. anemometer. ...

Key Vocabulary weather Weather is the conditions of the air outside relating to rain, snow, heat, cold, etc. Conditions. Temperature. forecast. sunny Sunny means with a lot of sunlight. sun burn. cloudy Cloudy means to be covered with a lot of clouds. windy Windy means with a lot of wind. rainy Rainy means having a lot of rain. snowy Snowy means to be covered with snow. sleet Sleet is a mix of rain and snow. bundle up (wear a lot of protection). ...

Key Vocabulary infant An infant is a bady. An infant cannot walk or talk. newborn. toddler A toddler is a very young child. A toddler learns to walk and talk. 1-3 years old. child A child is a very young person who is no longer a baby but not yet a teen. A child goes to school. kid. 4-12 years old. teen A teen is a person between the ages of 13 and 19. Teens are young adults. teenagers. ...

Key Vocabulary adaptation An adaptation is a body part or a behavior that helps a living thing meet its needs. camouflage Camouflage is the color or shape that helps an animal hide. blends in. carnivore A carnivore is an animal that only eats meat. A carnivor is at the top of the food chain. herbivore An herbivore is an animal that only eats plants. A rabbit is an herbivore. wild ...

Key Vocabulary living things living things need water, air, and food to live. Animals and plants are living things. nonliving things Nonliving things do not need water, air, and food. Rocks and water are nonliving things. environment An environment is the place where a living thing lives. survive Survive means to continue living. A living thing needs water, air, and food to survive. grow Grow means to get bigger. If you have food and water, you will grow. cycle of life. ...