【英语时差8,16】奇怪的熔岩（下）

Over eons, flowing water carved new valleys to the sides of the hardened lava¹. The hard lava didn’t erode² as much as the surrounding rock, eventually giving the landscape the appearance it has today. Think about pouring hot candle wax down a channel in a hill of sand, then blowing away some of the sand after the wax has hardened. Unfortunately, no. For that theory to work, the lava flows would have to be much older than they are. Dating of the hardened lava reveals that it might even be as young as the most recent ice age. Can you solve the mystery of the mountain-climbing lava? Tune³ in to our next program for the solution!

1 lava   

n.熔岩，火山岩

参考例句：

• The lava flowed down the sides of the volcano.熔岩沿火山坡面涌流而下。
• His anger spilled out like lava.他的愤怒像火山爆发似的迸发出来。

2 erode   

v.侵蚀，腐蚀，使...减少、减弱或消失

参考例句：

• Once exposed,soil is quickly eroded by wind and rain.一旦暴露在外，土壤很快就会被风雨侵蚀。
• Competition in the financial marketplace has eroded profits.金融市场的竞争降低了利润。

3 tune   

n.调子；和谐，协调；v.调音，调节，调整

参考例句：

• He'd written a tune,and played it to us on the piano.他写了一段曲子，并在钢琴上弹给我们听。
• The boy beat out a tune on a tin can.那男孩在易拉罐上敲出一首曲子。