One Hypothesis Explains the Extinction of Dinosaurs by Suggesting That

question 48

Multiple Choice

One hypothesis explains the extinction of dinosaurs by suggesting that a large meteorite collided with the Earth some 65 million years ago. This hypothesis is best supported by all of the following observations EXCEPT:

• A) a worldwide layer of iridium that appears in rocks of the extinction age.
• B) a meteorite impact site in Canada that is large enough and of the extinction age.
• C) the worldwide presence of microscopic glassy spheres, called microtektites, in sediments of the correct age to coincide with the extinctions.
• D) the fact that iridium is rare on Earth but is common on meteorites.