What do these two changes have in common? saliva breaking down a piece of bread

a penny tarnishing

Select all that apply.

both are caused by heating
both are chemical changes
both conserve mass
both are changes of state

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

Adrought killed all the plants in an agricultural farmland. gradually, due to wind and some birds for. nearby areas, new plants started sprouting l. what stage of succession was taking place in the farmland? a) competition b) nudation c) ecesis d) reaction e) migration

Moving down the ramp from 6 meters to