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Weather: Air Pressure

By Janice VanCleave

Meteorology is the study of weather in a given region. Weather refers to whats going on in the troposphere (atmospheric layer next to the Earth). In other words, weather is the condition of the air layer above the Earth at a given place and time. Weather reports include air temperature, humidity (how wet the air […]

Filed Under: Earth Science Tagged With: air pressure, clod formation, meteorology

Cloud Formation Video

By Janice VanCleave

After watching the video, check out some of the other posts on this website about clouds. EARTH SCIENCE BOOKS Earth Science is the study of the Earth, which includes the atmosphere (air layer), lithosphere (solid materials-rocks), and hydrosphere (water-oceans, rivers, lakes,and streams)  

Filed Under: Earth Science

Cloud Colors

By Janice VanCleave

Question: Why are clouds white? Answer: Clouds are white because white light comes from the clouds to your eyes. Now let me explain where this white light comes from. 1. Light from the sun is white. This means it is made up of all the colors of the light spectrum, which are the colors of […]

Filed Under: Earth Science Tagged With: absorb, clouds, concentration, scatter

Cloud Formation

By Janice VanCleave

Question:How are clouds formed? Answer: Clouds are made of very tiny drops of liquid water called cloud drops or cloud droplets. Cloud droplets stick together to form larger heavier raindrops, which fall to the ground where they collect in puddles, lakes, rivers, and oceans. The water molecules on the surface of collected water (rivers, streams, […]

Filed Under: Earth Science Tagged With: cloud drops, cloud formation, condensation, evaporation, meteorology

Water Cycle Diagram

By Janice VanCleave

A simple diagram with definitions describing the different forms of water as it moves through the water cycle.

Filed Under: Earth Science Tagged With: accretion, condensation, evaporation, precipitation, water cycle

Daylight Saving Time: History

By Janice VanCleave

Using a Sundial

Standard time refers to sun time, or time one would determine using a sundial. A time zone refers to a region of the Earth that has adopted the same standard time, usually called local time. Time zones were established in the in the U.S. and Canada by the railroads in 1883. But it wasn’t until […]

Filed Under: Earth Science

Atmospheric Pressure

By Janice VanCleave

Atmospheric Pressure The force of air molecules pushing on a surface Also called air pressure or barometric pressure. Air A mixture of gases containing about 78% nitrogen, 20% oxygen, and 2% other gases including carbon dioxide and water vapor. Gas molecules are separate from each other and in constant motion. Words to Know air air pressure […]

Filed Under: Earth Science

Air Pressure

By Janice VanCleave

Gravity vs. Air Density

What is air pressure? Pressure is a measure of a force on a specific area of surface. Air pressure is the force of air on an area of surface.This is a good definition, but it doesn’t tell you what’s happening. So here is the nitty gritty about how I understand the cause of air pressure: Air […]

Filed Under: Earth Science

Sky Color

By Janice VanCleave

Blue Sky The sky appears to be a colored surface above the Earth. During the day the sky’s color varies in shades of blue. At sunrise and sunset its colors may be vivid shades of red, pink, orange, yellow, and blue. Your eyes have special light receiving cells called cones. These cells take in light […]

Filed Under: Earth Science, Physics

Atmospheric Temperature vs. Altitude

By Janice VanCleave

Celsius Thermometer

Temperature is a physical property of how hot or how cold matter is. Cold Objects have a low temperature. Hot Objects have a high temperature. A thermometer is the instrument used to measure temperature.There are several different thermometer scales, the diagram shows a model of a Celsius thermometer. Note that this scale is marked in […]

Filed Under: Earth Science Tagged With: air temperature, altitude, atmosphere

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Welcome to Janice’s Science Extravaganza!

The spoon hanging from the string vibrates when struck and these vibrations are transmitted through the string and the sound is amplified by the plastic cups. ABOUT ME: Hi, I am Janice VanCleave, author of 50 best-selling science experiment books for children ages 4 through high school. I taught science for 27 years. MORE.....

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