Bombs can explode upon impact with the ground, but whether or not they actually do depends on the type of bomb, its design, and its intended function.
Some bombs, such as aerial bombs or artillery shells, are designed to explode upon impact. These bombs typically have a fuze mechanism that triggers the explosion when the bomb strikes a solid surface. The fuze may be sensitive to impact, pressure, or other factors, depending on the specific design.
On the other hand, there are also bombs designed to penetrate the ground or structures before detonating. These bombs, known as penetrating or bunker-busting bombs, are built to withstand impact with the ground or other hardened targets. They are designed to penetrate the surface before detonating their explosive payload inside the target.
It's important to note that the behavior of bombs can vary depending on their purpose and design. Some bombs, particularly those used in military operations, are designed to have specific effects and functions, such as creating an explosion, destroying a target, or generating a shockwave. The specific circumstances of a bomb's deployment and its intended use determine whether it will explode upon impact or have another function.