Paleo-Indians groups spread throughout North America. A. slowly B. rapidly C. by ship D. by horse

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

Which of the following best describes asbestosis?

Identify the type of weathering seen in each picture ? chemical weathering mechanical weathering