Elden grows wheat on his land. However, his wheat farm is on a steep slope and hence more prone to soil erosion. In order to prevent soil erosion, he rotates wheat with soybean. What type of soil conversion method did Elden use?

What does the law of conservation of mass state?

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3

How do you know how many valence electrons an atom has?