Why are rainbows half circles ? L ight and raindrops work together to create a ring of coloured light opposite the sun. We see part of that ring as the curved arc of a rainbow. Here's how it works: the sunlight that shines …

Why is the sea water salty ? As the rains fall and water flows over the land, the water dissolves salt out of the rocks, washes the salt into streams, then rivers, and finally carries the salt to the sea. The salt stays in the …

Which is the saltiest sea in the world ? The   Dead Sea-devoid of life, except for bacteria, and so salty it quickly kills river fish swept by floodwaters into its brine -is the saltiest sea on Earth. This land -locked lake ge…

Does alcohol kill brain cells ? Alcohol No , usually brain cells are not killed . Alcohol does not kill brain cells but rather damages dendrites--the branched ends of nerve cells that bring message into the cell. Alcohol surely…