1. Hypothesis
The initial building block in the scientific method. Many describe it as an “educated guess,” based on prior knowledge and observation. 

2. OBSERVATION
An act or instance of viewing or noting a fact or occurrence for some scientific or other special purpose using the five senses.

3. A conclusion reached on the basis of evidence and reasoning.
Inferance
A conclusion reached on the basis of evidence and reasoning.

4. Facts and statistics collected together for reference or analysis.
DATA
Facts and statistics collected together for reference or analysis. 

5. VARIABLE
A variable is any factor, trait, or condition that can exist in differing amounts or types.

6. Theory
A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment

7. LAW
A scientific law is a statement based on repeated experimental observations that describes some aspects of the universe

8. The international system of measurement used in science.
Metric system
The international system of measurement used in science.