PARENTS! EQUIP YOURSELVES BY READING THE TOPICS OF THIS SITE AND BE PROUD!
IF YOUR CHILDREN ASKS QUEER QUESTIONS AND YOU DO NOT KNOW THE ANSWER, YOU WILL CUT A SORRY FIGURE. EQUIP YOURSELVES BY READING THE TOPICS OF THIS SITE AND BE PROUD!
70.HOW AN ECHO TRAVEL THROUGH WATER?
Now that we know something about sound, let’s find out what makes an echo and whether an echo can travel through water.
Sound travels outward from its source at a speed of about 375 meters per second in open air. Sound travels in waves much like the ripples made by a pebble thrown into the water. However, sound waves go out in all directions like the light from an electric bulb.
69.WHY DOESN’T AN IGLOO MELT INSIDE?
Even though stone and wooden houses have become more popular among the Eskimos, they still construct the igloo for special occasions or while on a journey. It is quickly built and it defies any kind of weather.
A trench is cut about 1.5 meters long and 50 centimeters deep in a new snow drift. Then, from the face of the trench, blocks are cut with a knife. These are shaped so that they lean inward when set on edge.
