Reviews how to use topographic and geologic maps.
Come up with questions about a topic and learn new vocabulary words to determine answers using an Ask, Answer, Learn table.
Sinkholes can occur in almost any type of rock but are most common in limestone and other karst toporaphy. People and property have been swallowed by sinkholes.
This link provides an explanation of how topographic maps are made, and explains how to read the contour lines on these maps.