Answer:
Option 2
Explanation:
<--> symbol means you must interchange (swap) Row 1 and Row 2. This means you must switch the two rows where row 1 (-1 1 2 | 7) takes place of row 2 (-3 2 1 | 4) and vice versa.
Answer:
they needed a sword that was both hard and flexible but would not bend or break
Explanation:
Japanese smiths solved this problem by making the core of the sword with a soft metal that wouldn't break.
A thick mixture of clay and charcoal powder is applied to the blade's upper sides and dull back edge, leaving the sword's primary edge only lightly coated so that it would be flexible.
The correct order is the crust, mantle, outer core, then inner core.
