Why do some metals lose their shine over time but not gold ?

Which statement about sound is not true? a. air particles travel with sound waves. b. sound waves cannot travel through a vacuum. c. sound waves exist even if no one hears them. d. air particles vibrate along the path of a sound wave.

Is this a scientific model? use complete sentences to explain why or why not. a graphic organizer showing the water cycle

What are four significant sources of ghgs that come from wostem washington?