The half-life of carbon-14 is approximately 5700 years. An archaeologist unearths a piece of wood that is determined to have 83% of its carbon-14 remaining. Using carbon-12 dating techniques, approximately how old is the ancient
piece of wood that she located?
A)
approximately 675 years old
B)
approximately 1,550 years old
approximately 3,700 years old
D)
approximately one million years old

Estructura 7.2 completar repaso 1 - ¿lógico o ilógico? 1 - ¿lógico o ilógico? listen and indicate whether each question and response is lógico or ilógico.

Subduction zones occur on earth where dense oceanic crust dives under more buoyant continental crust. these boundaries are characterized by a deep ocean trench next to a high continental mountain range, large numbers of earthquakes and volcanoes. all of this is further evidence for the a) big bang theory b) origin of the species eliminate c theory of plate tectonics d theory of natural selection 4 sedimentary rocks found high in the himalayen mountain

Which of these best describes an ionic bond?