Question

1. choose the best answer.

mountain chains are formed by ______.
radioactive energy
earthquakes
tectonic forces
weathering

Explanation:

Mountain chains are formed by tectonic forces. Tectonic forces involve the movement of Earth's lithospheric plates. When plates collide (convergent plate boundary), the crust is compressed and uplifted, creating mountain ranges. Radioactive energy is related to processes like heating the Earth's interior but not directly to mountain - chain formation. Earthquakes are often associated with plate movements but are a result of sudden energy release rather than the primary cause of mountain - chain formation. Weathering is a process that breaks down rocks and erodes landforms, which acts to wear down mountains over time, not to form them.

Answer:

tectonic forces