1 Wear safety goggles to protect your eyes. 2  Never use a plunger if a chemical cleaner is present in the drain; you risk splashing the chemical on yourself.  Never remove a trap with chemicals present; you risk burns to your skin. Call a professional but make certain you inform them of what chemical you used.
Originally Answered: Why is the Moon drifting away by 1 cm each year? Because of tidal forces between moon and Earth. As Earth and moon pull each other, bulges are created on the surface.
Answer: Many people grow up with the idea that the phases of the moon are caused by the shadow of the earth. The earth does cast a shadow (as does any object in sunlight), but the moon usually passes above or below it. When the moon does pass through the earth's shadow, it is called a lunar eclipse (see illustration at right). When the moon passes into the shadow of the earth, it can at first glance mimic some of the phases, but the effect is in fact very different.