earth crust and plates

Question 1

what is a continental shield

Answer 1

tectonically stable area, made from oldest rocks on earth

“shield is generally a large area of exposed Precambrian crystalline igneous and high-grade metamorphic rocks that form tectonically stable areas.[1] In all cases, the age of these rocks is greater than 570 million years and sometimes dates back 2 to 3.5 billion years.[2] They have been little affected by tectonic events following the end of the Precambrian Era, and are relatively flat regions where mountain building, faulting, and other tectonic processes are greatly diminished compared with the activity that occurs at the margins of the shields and the boundaries between tectonic plates.”

Question 2

continental slope angle

Answer 2

4-10 degrees

Question 3

how is the richter scale determined from a siesmogram?

Answer 3

magnitude of p/s waves