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