Sinkholes (True Bookextreme Earth)De (autor) Ann O. Squire
en Limba Engleză Paperback – February 2016 – vârsta de la 8 până la 12 ani
That is precisely what can happen when a sinkhole forms underground. Readers (Grades 3-5) will find out how water can wear away at underground rock and cause it to weaken over time. They will also learn how human activities can increase the risk of sinkholes and how sinkholes are predicted and repaired.