Subjecting sedimentary rocks to extreme heat and pressure form what rocks?

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

Audrey planned to move from iowa to arizona. en route, she was offered a job in colorado, which she accepted. she now lives in denver, colorado, and works for an athletic apparel design company.

Due to its high humidity, the south often experiences severe storms with heavy rains called cyclones ,hurricanes, monsoons, tornadoes