Here is the four different Casting Processes in youtube, please write a paragraph for each video. Also, Please write it in easy language because I’m international student.

Sand Casting https://www.youtube.com/watch?v=2Qn0gZ86Xzg

Shell Molding https://www.youtube.com/watch?v=WVO0GY1cI74

Investment Casting https://www.youtube.com/watch?v=7mkrY4i3ODU

Powder-Metallurgy Process https://www.youtube.com/watch?v=O7U4HWjYcqo