A new event related to a previous event.

Very new and different from what is traditional. person who advocates thorough or complete political or social reform.

extending or performed in long, continuous curve. dirt or refuse collected by sweeping. To search a very wide area for something.

continuing or valid to final destination. expressing movement into one side and out of other side of opening etc.. Over, in, across an entire thing or place.

presence in or introduction into environment of substance which has harmful or poisonous effects.

To make, cause, or bring into existence.

unwelcome or harmful matter. Questions to show understanding of a math concept.

An activity you wish to try that may be hard to do. To formally invite someone to compete at something.

Capable of continuing for a long time.

of great vertical extent. at or to considerable height.

make something needed or wanted available to someone.

person who plans look or workings of something prior to it being made. People who create plans to make some things.

in way that lasts or remains unchanged indefinitely.

An oxide containing two oxides per molecule.

on condition or understanding that. To make certain something will happen or be done.