20xx春西师大版数学三下42轴对称ppt课件1

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作用。 河水越多，流速越快，搬运力量就越大，大的、重的石块、搬运的距离近；小的、轻的石块，搬运的距离远。 岩石在被河水搬运过程中，由于受到河水的冲刷，以及岩石间的相互摩擦、碰撞，棱角被逐渐磨去，体积逐渐变小，成为圆圆的卵石。 模拟实验 • 找到 2~3块有棱角的小砖块，将其形状记录在表中； • 将小砖块放入玻璃瓶中，并加入适量沙河水，拧紧瓶盖； • 每位同学一次快速用力摇动玻璃瓶一分钟

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