Identify the technique of separating mixtures. P for Picking W for Winnowing and S for sedimentation

Which objects allow humans to access groundwater? check all that apply.

Which type of seismic waves are confined at the surface

What characteristic of the basin that feeds the congo river system affects movement in central africa? a. the center of the basin is a dense rain forest. b. it is the center of ethnic conflict in the area. c. wildlife on the savanna makes it too dangerous to travel. d. the basin is surrounded by desert.