2 Identify one change that would cause an increase in the rate of stream erosion in the river
valley in the mountains.
(1 Point)
Mountains
Plateau
Coastal plain
Ocean
akes
Delta
Meanders
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The chemical bubbles

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.