Why and how do continents move?                                   9
How is age of fossils determined?                                11
How is the height of mountains measured?                         14
Why are there two high tides each day?                           14
Are waves formed only near the sea shore?                        15
How is depth of oceans measured?                                 16
What causes the corrugations in dirt or sand roads
after they have been used by vehicles for
several weeks? Why do corrugations occur with
the same frequency despite difference in vehicle
tyres and wheel diameters?                                       17
Where does sand come from? Has any thought been given
to manufacturing it?                                             17
Why is lava flowing out of a volcano hot?                        18
I have always believed that in hot, sunny weather
it is best to wear white or light-coloured clothing
because this reflects the heat. But a friend insists that the
opposite is true and that black clothing is better because
it helps to radiate heat from the body. Who is right? Or
is a combination of the two - black on the inside and
white outside - the best option.                                 20
What is ball lightning?                                          21
Why are rain clouds black?                                       22
What causes monsoons?                                            23
Why does rain fall as drops and sheets?                          24
How do we measure rainfall?                                      24
Why is there a peculiar smell after a shower (rain)?             27
How is rain produced artificially?                               27
Why are rainbows arc shaped?                                     29
What determines the size of rainbow? They obviously
vary as shown by double rainbows.                                30
Heat is supposed to rise. Why then, is it colder on top of a
mountain than in the valley below?                               32
How is sound produced in thunder?                                34
Why are our fingers cooler than the rest of our body
during winter?                                                   34
What makes coconut oil freeze during winter?                     35
Can any one throw some light on Bermuda Triangle?                36