Identify the series of geologic processes that can transform 1. sediment into shale,

2. shale into slate, and

3. slate into magma.

a
1-cooling; 2-melting; 3-heat and pressure
b
1-compacting and cementing; 2-heat and pressure; 3-melting
c
1-melting; 2-heat and pressure; 3-cooling
d
1-weathering and erosion; 2-compacting and cementing; 3-cooling

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a