Which items did Mendeleev write down on note cards while he was observing different elements?
Check all that apply.
A. Color
B. Density
C. Atomic mass
D. Buoyancy

Which activity describes an application of topographic maps? check all that apply. recreation, such as camping and hiking engineering, such as the construction of roads and buildings science, such as mapping stars in the sky business, such as analyzing population centers science, such as analyzing surface features