These would then fall down to the base of the mantle like sparkly hailstones.

然后它们会像闪闪发光样落到地幔底部。

In a few minutes, rocks were falling like hailstones around them and around us.

几分钟内，石块像样落在他们和我们身边。

The largest hailstone ever recorded in the United States was found in July 2010 in Vivian, South Dakota.

2010年7月，美国南达科塔维维安发现了有史以来最大。

And speaking of bizarre, the largest hailstone ever found measured in at roughly 20 cm, weighing almost 1 kg.

说到离奇，目前发现最大大约20cm，重量近1公斤。

How accurate is the recreation of these hailstones?

这些再现有多准确？

Hailstones have been measured up to 20 centimeters in diameter.

据量，直径可达20厘米。

So the bigger the hailstone, the faster its terminal velocity.

因此越大，其终端速度越快。

Out of the brightness of his presence clouds advanced, with hailstones and bolts of lightning.

因他面前光辉，他厚云行过，便有火炭。

Meanwhile, giant hailstones pounded the main camp.

与此同时， 巨大袭击了主营地。

Captain Lewis reported that the hailstones were as wide as seven inches.

刘易斯船长报告说有七英寸那么宽。

Now the coins sounded like hailstones hitting a windshield.

现在硬币听起来就像打在挡风玻璃上样。

But a baseball and the largest hailstone measured deliver more than 80 Joules.

但球和最大可提供超过 80 焦耳能量。

So this is the United States and current world record hailstone that was found in Vivian, South Dakota.

- 这是美国和目前世界纪录，是在南达科他州维维安发现。

However, it is possible for very large hailstones (diameters exceeding 4-inches) to fall at over 100 mph.

但是， 非常大（ 直径超过 4 英寸） 可能会以超过 100 mph 速度落下。

Early research assumed that hailstones fell like solid ice spheres and showed very high fall speeds, even for very small hailstones.

早期研究假设像固体球样下落， 并且显示出非常高下落速度， 即使对于非常小也是如此。

Hailstones then grow by colliding with liquid water drops that freeze onto the hailstone's surface.

颗粒随后通过与液态水滴碰撞并将这些水滴冻结在其表面而增长。

A laser thunder factory could shake the moisture out of clouds, perhaps preventing the formation of the giant hailstones that threaten crops.

激光雷工厂可以抖落云层中水分，或许可以防止威胁农作物巨型形成。

Hailstones are formed when raindrops are carried upward by thunderstorm updrafts into extremely cold areas of the atmosphere and freeze.

颗粒是在雨滴被雷暴上升气流携带到大气中极冷区域并冻结时形成。

The conditions experienced by the hailstone can change as it passes horizontally across or near an updraft.

当颗粒水平穿过或接近上升气流时， 它所经历条件会发生变化。

Hailstones also do not grow from being lofted to the top of the thunderstorm.

此外，颗粒也不会因为被抬升到雷暴顶部而生长。