Which techniques can scientists use to determine the characteristics of earth's layers? select the two correct answers.

What is the leading cause if water scarcity throughout much of the world

You can reduce glare in snowy weatuer by?

Which of the following ideas did greek philosopher democritus contribute to the atomic theory? a. each object is made up of one atom, which varies in size from very small to very large. b. matter is composed of only one kind of particle, which can be easily destroyed. c. every element has a specific type of atom, which remains the same size in all forms of matter. d. all matter is composed of small particles, which combine to make larger objects.