Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm3. What is the density of the pen?

Identify the type of synthetic material used in each object

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

Write down two additional questions about earth's magnetic field that will make your presentation more informative.