石头是从哪里来的?为什么有的石头有花纹?
Where do rocks come from — why do some have stripes?
石头是地球写日记的方式:有的来自喷火的火山,岩浆冷却变硬;有的是泥沙在大海里一层层压了千万年变成的,花纹就是当年的泥沙层。捡一块鹅卵石,你手里就握着一个古老的故事。
Rocks are how Earth keeps diaries: some froze from fiery volcano lava; others pressed from seafloor mud over millions of years — those stripes are old sand layers. Hold a pebble and you hold an ancient story.
来源 · Source
《十万个为什么》第六版地球分册,少年儿童出版社,2013
Ten Thousand Whys: Earth volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289