Ships and airplanes go all the way around the earth. So we know that the earthisround. Itis shaped like a ball.
The balls you play with are about ten or twenty inches around. But the earth is 25,000 miles around.
Think of a ball as large as that!
We live on the outside of the earth. This outside part is called the earth’s surface.
The balls you play with are about ten or twenty inches around. But the earth is 25,000 miles around.
Think of a ball as large as that!
We live on the outside of the earth. This outside part is called the earth’s surface.
The Sky at Night
It was Jim's bedtime, and Mother went into his room to say good-night.
Jim was looking out the window.
"My! How bright the sky looks!" he said.
"Yes," said his mother. "The sky looks bright tonight because we see so many stars."
Mother and Jim looked at the moon and stars a little while longer.
Soon Mother saw that Jim's eyes were almost shut.
So she said good-night to him and turned out the light.
But Jim was not in the dark.
The big round moon was shining on his bed.
It was Jim's bedtime, and Mother went into his room to say good-night.
Jim was looking out the window.
"My! How bright the sky looks!" he said.
"Yes," said his mother. "The sky looks bright tonight because we see so many stars."
Mother and Jim looked at the moon and stars a little while longer.
Soon Mother saw that Jim's eyes were almost shut.
So she said good-night to him and turned out the light.
But Jim was not in the dark.
The big round moon was shining on his bed.
Experiment 2.
Can moving water carry soil?
Make a hill of dry soil and pour water over the top of the hill. The water runs down the hill in little streams, taking soil with it.
Where does the soil go?
Does the water make little ditches in the hill?
Pour more water on the hill and see if the ditches get bigger.
Can moving water carry soil?
Make a hill of dry soil and pour water over the top of the hill. The water runs down the hill in little streams, taking soil with it.
Where does the soil go?
Does the water make little ditches in the hill?
Pour more water on the hill and see if the ditches get bigger.
All you need to make your own snow are a book of safety matches, a silver coin, a drop of iodine and some cold air in an enclosed space. A black background and a flashlight help, however, by making the tiny flakes visible. The procedure is shown below. For cold air, try any of the following: (1) the inside of a home freezer or a frozen-food cabinet; (2) a big empty jar, chilled by packing dry ice around it in a bucket (but don’t touch the dry ice with bare hands!); (8) the inside of a closed car, or a similar space, on a cold winter night. Blowing into the ice-cube section of a refrigerator won’t work, because all the cold air spills out of it when the door is opened.
“How to make snow at home.”
Popular Science. June 1947.
“How to make snow at home.”
Popular Science. June 1947.
VISUAL FLOW
Figs. 1-4. The giant stride, or hurdy gurdy. The popular recreator. 1873.
Ben Shahn - Liberation (1945)