Question: 4.6 billion

Answer: scientific evidence suggests that the earth is ________ years old

Question: rocks fossils

Answer: evidence for events that occurred in the earths history is provided by____ and the ____ within the rocks

Question: relative age

Answer: the ________ ___ of the rocks can be found by the way the rocks are layered

Question: older younger

Answer: ______ rock are found deeper, ______ rocks are found closer to the surface

Question: superposition

Answer: the older rocks are found deeper and the younger rocks are found closer to the surface. this law is called______

Question: absolute age radioactive radio metric dating

Answer: the ______ ___ of rock layers can be determined by _____ elements in the rocks. this is known as _____ _____

Question: oldest

Answer: this was done on the _______ rocks found on the earth

Question: biodiversity life

Answer: the divisions of the geologic time scale represent major changes in the ______ of _____

Question: bacteria

Answer: the earliest life on earth was simple______

Question: jellyfish

Answer: then algae, worms and ______ appeared

Question: complex

Answer: life became more _______ as the earth grew older