TopRq.com

A car wash or auto wash is a facility used to clean the exterior and, in some cases, the interior of motor vehicles. Categories While there are many different types of car washes, most fall into the following categories: • Hand car wash facilities, where the vehicle is washed by employees. • Self-service facilities, which are generally coin-operated, where the customer does the washing, including "jet washing"...

In botany, a leaf is an above-ground plant organ specialized for the process of photosynthesis. For this purpose, a leaf is typically flat (laminar) and thin. As an evolutionary trait, the flatness of leaves works to expose the chloroplasts to more light and to increase the absorption of carbon dioxide at the expense of water loss. In the Devonian period, when carbon dioxide concentration was at several times its present value, plants did not have leaves or flat stems...

...

A rainbow is an optical and meteorological phenomenon that causes a spectrum of light to appear in the sky when the Sun shines on to droplets of moisture in the Earth's atmosphere. It takes the form of a multicoloured arc, with red on the outer part of the arc and violet on the inner section. A rainbow spans a continuous spectrum of colours; the distinct bands are an artifact of human colour vision...