Witch one is it soo it the the question b. a,b, c,d

Palo duro is the largest canyon in north america. t f

1) name any two states which are leading producer of cotton textile in india 2) wht information technology 3) name any two countries which are leading producers of cotton of cotton textile 4) wht is add to pig iron to convert it into steel

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