Draw a line scale to show 1cm represent 100 m​

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

What body of water is the second cataract of the nile river submerged under

Agricultural practices in the united states nearly led to the extinction of the peregrine falcon during the 1950s and 60s.