A flyby is a quick look at something. Sometimes astronauts will fly by Earth to take pictures or to measure how fast the planet is moving.
Weirdly is used to describe something that is very unusual or unexpected. When you say that something is weirdly shaped, you mean that it is not the usual shape for that kind of object.
To solidify is to make something solid, to make it more firm or stable. When you solidify a liquid, you make it into a substance that is easier to handle.
Geologically means relating to the earth and its rocks and minerals. It can also refer to the study of the earth's history.
To harness something is to put it into control or to make it work for your own purposes. When you harness a horse, you make it work for you by tying it to a cart or a wagon.
To knead something is to mix it with your hands and squeeze it until it's soft. You might knead dough to make bread, or you might knead dough to make dough balls.
Volcanically means very quickly. When you say that something is volcanically angry, you mean that they are very angry and upset very quickly.
Bivalves are animals that have two shells. They are usually marine animals, which means that they live in the water.
An impassable barrier is a barrier that is too difficult or impossible to cross. A wall that is impassable is too high or too thick to get through.