When geologists want to study an active earthquake fault, they often rely on a trenching study. ... They brace the walls, if needed, to prevent cave-ins, then they climb down into the trench and carefully map its walls, looking for signs of past earthquakes and ground movement.
Permian-Triassic extinction
Early 1800's. The Erie Canal was built in 1817
<span>The number of live births per 1,000 people in a year is known as the Crude birth rate!
This link might help you for other questions on this subject!
</span>https://quizlet.com/27830079/chapter-7-flash-cards/
Hope I helped! Please put brainiest! <3
