The Moon’s surface is covered with craters overlain by a layer of soil called regolith. Nearly all the craters were formed by explosive impacts of high-velocity meteorites.
- crater [ˈkreitə] n. 环形山
- overlie [ˌəuvəˈlai] v. 在……上面
- regolith [ˈreɡəliθ] n.风化层
- explosive [iksˈpləusiv] adj. 爆炸(性)的
- impact [ˈimpækt] n. 冲击
- velocity [viˈlɔsiti] n. 速率
- meteorite [ˈmi:tjərait] n.陨星
