Compound. An element is just composed of itself. A carbohydrate is a complex compound made with carbpn and lots of other elements
Waves interact with matter in several ways. The interactions occur when waves pass from one medium to another. Besides bouncing back like an echo, waves may bend or spread out when they strike a new medium. These three ways that waves may interact with matter are called reflection, refraction, and diffraction.
Its usually never the obvious one.. so cross speed out & put A. Velocity.
The elements oxygen and silicon make up most of the Earth's crust including silicate minerals such as quartz and feldspar
