Answer:
Melting point
Explanation:
Pure substances have sharp melting and boiling points while impurities lower the melting point and raise the boiling point
The answer is one dot.
The number of dots an element has represented in the diagram, indicates how many valence eletrons( which is the number of electrons in the most exterior energy level of an atom or ion) the element has. So, 1 valence eletron equals one dot.
A logarithmic scale is a nonlinear scale used when there is a large range of quantities
Answer:
The study of movement, distribution and quality of water.
Explanation:
They measure the properties of bodied of water, such as the volume of and stream flow.
