Which type of ground fire occurs when the projectile travels downward at a steep angle?

Plunging fire is characterized by the projectile traveling downward at a steep angle, typically toward a target that is below the level of the attacker, such as when firing from a high point at low-lying enemy positions. This type of fire is effective because it minimizes the cover available to the target, making it difficult for them to avoid being hit. The steep angle of descent can increase the impact energy and damage to the target, as the rounds strike with greater velocity.

In contrast, grazing fire occurs with a projectile that travels close to the ground, maintaining a relatively flat trajectory, allowing effective engagement of targets at shorter ranges. Dead space refers to areas where direct fire cannot reach due to terrain features, effectively creating zones where fire cannot be applied. Fixed fire typically refers to fire directed at a specific location that does not adjust for enemy movement or changes in position. Thus, plunging fire has unique tactical advantages, especially in elevated terrain, making it the correct answer.