Maps are a recent invention of modern society.
a. true
b. false

What is the approximate circumference of the circle shown below? 12.2 cm

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 is the approximate chemical composition of the solar nebula?