APSC 151 Midterm Exam Study Guide | 100% Correct | Verified | 2024 Version

Compared to the age of the Universe of about 14 billion years, the currently accepted age of Earth is about ________ years as determined by using radioactivity for dating rocks and minerals. A) 4.6 thousand B) 4.6 billion C) 5.4 million D) 13.7 billion - B The ________ division of the geologic time scale is an era of the Phanerozoic Eon. A) Paleocene B) Paleozoic C) Permian D) Proterozoic - B The Earth's core was formed from ________. A) a massive nickel iron asteroid that was the nucleus upon which Earth condensed B) high density radioactive carbon C) the left over nickel and iron that would not fit into the earlier formed crust and mantle D) molten iron and nickel that separated from silicates and sank due to its higher density - D