Which type of matter allows a sound wave to move the fastest

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

According to the sector model, in which region or regions would you most likely find industrial and transportation development?

Actions being undertake to address climate change in western europe include?