1. During primary ecological succession, the initial formation of soil helps establish — * C. shrubs
D. trees
A. grasses
B. mushrooms

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?