We're back in Bangladesh now. We're spending the week exploring more anticlines (folds) and meeting with our colleagues who study the rivers. Today we got to see tube well drilling.
Each time the pipe drops down, a squirt of sand, mud and water comes out the top. They catch some in a bucket and then they can study its composition and see how it changes as they dig deeper.
Our colleague Professor Goodbred has an awesome tool called the XRF. It stands for X-ray Fluorescence. It shoots x-rays at a sample of sand and measures different elements. The chemistry can tell us where the sand came from! This helps us learn about where the rivers were in the past. We work with scientists who study rivers because rising mountains and earthquakes can cause the rivers to change course!