1. The sun and other stars produce visible light by

a. fluorescence.

b. luminescence.

c. incandescence.

d. electroluminescence.

What is the force that keeps the planets in orbit

Select all that apply. Which of the following are homogeneous solutions? salt water air sand and water vinegar cement

There are seven ___ included in the periodic table.

Why does a rolling sphere slows down?

The liquid in one container drops 100 F, while the same liquid in a different container drops 100C. How does the change in thermal energy in the two compare? Explain your answer.

How does physical change affect the identity of a substance

A scientist pours grape juice on three identical white shirts He then uses three different cleaning products on the shirts and measures how clean they get what is the independent variable in this experiment

What part of the atom does nuclear radiation come from?

Why should scientists write reports and give oral presentations of the steps and results of their in investigations?

Which of these rocks are formed by volcanic activity? select the two correct answers. a. marble b. basalt c. limestone d. granite e. sandstone