太阳（the sun）
all life on our earth depends, in one way or another, on the sun. without its light and warmth, there would be no life. the sun gives us our food and our clothing material. it even gives us our coal, too. the sun also makes our day and our night. light travels in straight lines. it comes from the sun 45,000,000 miles away.
the sun lights half the earth at a time. it is day on the lighted side. it is night on the dark side of the earth. almost every part of the earth turns from day to night during every 24 hours.
a sunny day in winter is colder than a sunny day in summer. this is because the summer day is longer, everything has a longer time to warm up and the sun shines more directly on the earth. in winter, the day is short, there is less time for everything to get warm and the sun doesn't shine more directly on the earth.
land, just like the sand, warms up more quickly than water but it also loses its heat more quickly. so on a hot sunny summer's day on the beach, you can feel how hot the sand gets. the water is cool to the feet when you go for a paddle.
the sun makes our earth beautiful. it gives us light. it keeps us warm. it makes things grow. we can not live without the sun.