자극

The act of watching something or someone carefully for a period of time, especially to learn something. It is the first step of the scientific method.

The science that deals with the Earth's physical structure and substance, its history, and the processes that act on it. Essential for TOEFL earth science sections.

Reciprocal action or influence; how two or more entities affect each other.

To estimate or guess what will happen in the future based on certain data or logic. It is a frequent word in scientific or economic reporting.

The point, edge, or line beyond which something cannot or may not proceed; a limitation or boundary.

A temporary explanation or idea that is suggested to explain something, but has not yet been proven true through research or experiments.

The relationship between a cause and its effect. In academic contexts, it refers to how one event leads to another.

To watch someone or something carefully and attentively over a period of time. This is often done to learn something or discover information.

A factor or element that is likely to change or vary in different situations, especially one that affects the result of something.

To suppose or assume something to be true for the sake of argument or investigation. It is a fundamental verb in academic hypothesis building.