Words that start with C

Compost is vegetable matter, rotted down so it can be used to fertilize and improve soil. You can make your own compost from lawn clippings, newspaper, food scraps and fallen leaves. Compost is best kept slightly moist, and turned regularly to aerate it. Worms in your compost will really help the composting process along, as the worms eat the food scraps and their castings become part of the compost.

A surface is concave if it curves inwards, forming a hollow. The coin slot in the picture is concave.
The opposite of concave is convex.

You are concentrating on something if you are completely focussed on it, and have blocked out all other distractions. People usually concentrate when they are doing something complicated that requires them to think hard without being interrupted.

A concert is a public performance of music, usually by a band or some other group of musicians.
Some concerts will have many hundreds of people in the audience.

Condensation forms when water vapour hits a cool surface and turns back into water. You often see condensation on a cold drink bottle, or on the inside of your windows on a cold morning. Condensation outside is often called dew.

Condors are a type of vulture found in the Andes and the Californian mountains. They are one of the largest birds in the world. They can live to 50 years old in the wild, and have a wingspan of up to 3 metres.
They spend a lot of their time soaring through the air looking for large dead animals to eat.

A cone is a shape with a round bottom that gets smaller as it goes until it reaches a point. If you cut a slice through a cone parallel to the bottom, it will be the same shape as the bottom. If you cut a slice through the cone vertically going through the top point, you will get a triangle.
Many things are cone shaped. volcanos tend to be cone-shaped, pinecones and pine trees like the ones in the picture are cone-shaped, and of course traffic cones are cone shaped.

Conifers are a large group of plants, with around 630 species. They are mostly trees but some conifers are shrubs. Conifers typically have needle-like leaves and their seeds form in cones.
Some examples of conifers are pine trees, firs, cedars, cypresses, junipers and yews.

A constellation is a group of stars that form a pattern in the night sky.

Constellations help people to navigate. Many constellations are named after myths or gods.

Contact lenses are small pieces of soft plastic gel that can be worn directly on your eyes instead of glasses.