What two things do plants produce?

In this channel of communication, messages are carried by sound and light waves. a. teleconference b. face-to-face c. voicemail d. hard copy memos

H2SO4 is a strong acid. Which two ions do you expect to find in a solution of H2SO4? A. H and SO4 B. H2 and SO4 C. 2H + and SO42- D. H2S and 2O2

What's the definition of sound?

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When Javier touches a hot mug of tea, energy is transferred from the surface of the mug to his hand. What kind of energy is this?

Fariza wears a red hat in her school play. On stage, she is lit by a spotlight shining only green light. When our eyes receive no light from an object, it looks black. Explain why Fariza's hat looks black on stage.

In a chemical reaction, one element replaces another element in a compound to form a new substance. Which of the following best describes this type of chemical reaction? Combustion Neutralization Double Replacement Single Replacement

If the Earth's crust contained twice as much iron as it does, would atmospheric oxygen buildup have been slowed down or sped up during the past 2.

Which of the following statements is true? A. Energy can change from one form to another. B. Matter and energy do not interact. C. Energy cannot be stored. D. Energy does not transfer from place to place.

Work is done when a force A. is exerted while pulling a wagon up a hill B. acts vertically on a cart that can only move horizontally C. is exerted by one team in a tug of war when there is no movement D.