Final answer:
The dune type with two arrows pointing right at each other, forming a ridge-like dune, is called a d. Parabolic dune.
Step-by-step explanation:
The dune type with two arrows pointing right at each other, forming a ridge-like dune, is called a d. Parabolic dune.
Parabolic dunes are characterized by crescent or U-shapes that curve away from the wind direction. They typically have horns pointing downwind and are formed by vegetation or other obstacles that stabilize the dune's arms.