Wednesday, May 4, 2011

Why is the sea water salty?

Wherever water comes into contact with the rocks of Earth’s crust, either on land or in the ocean or within the oceanic crust, some of the minerals in the rock dissolve and are carried by the water to the ocean. The salt content of seawater does not change because new minerals are forming on the sea floor at the same rate as salt is added. Thus, the salt content of the sea is at steady state.

Why is the door rectangle?

I think it is the best shape for the human body to pass through. A round door would be very hard to construct in order to come in or pass on it one need to bend. Square door will be in need of more space and need more wood for its length so why pay for more wood if its not necessary. Oval door one should step up into the house. Doors are not only created for human to come in sometimes we use them also for furnitures. Best shape architects invented that resemble to human was the shape of rectangle.