Question

why does fast-moving water lead to greater erosion than slow-moving water?
it has more energy.
it evaporates faster.
it usually flows in a straight line.
the particles it carries are smaller.

Explanation:

To determine why fast - moving water causes more erosion, we analyze each option:

• Option "It has more energy": The energy of water is related to its velocity (kinetic energy $KE=\frac{1}{2}mv^{2}$). Faster - moving water has greater kinetic energy. This extra energy enables it to dislodge, transport, and erode more sediment and rock material.
• Option "It evaporates faster": Evaporation rate is mainly affected by factors like temperature, surface area, and humidity, not the speed of water flow. So this option is incorrect.
• Option "It usually flows in a straight line": The path of water flow (straight or not) is not the main factor determining erosion. Erosion is more about the energy of the water to move particles, not the direction of flow. So this option is wrong.
• Option "The particles it carries are smaller": In fact, fast - moving water can carry larger particles due to its higher energy. Also, the size of particles carried is a result of erosion, not the cause of more erosion. So this option is incorrect.

Answer:

A. It has more energy