Author Question: What explanations have been proposed for the mass extinction at the K-T boundary? Why is a meteorite ... (Read 91 times)

ereecah · **on:** Jul 14, 2018

What explanations have been proposed for the mass extinction at the K-T boundary? Why is a meteorite the favored theory today?

What will be an ideal response?

Question 2

By 1900, the population of Latin America and the Caribbean had reached about ________ million.

A) 25
B) 75
C) 200
D) 525

gasdhashg · **Reply #1 on:** Jul 14, 2018

Answer to Question 1

Among the suggested causes for the K-T mass extinction are changes in sea level, meteorite impact, volcanic eruptions, and drastic changes in surface temperature and climate. The impact of a large (10 km) meteorite is the favored theory today because that explanation has had confirmation of a number of predictions, including the presence of a worldwide iridium anomaly, significant extinctions on the land surface and in the oceans, the presence of shock quartz, the prevalence of charcoal, the presence of sand-sized spherules, and perhaps most importantly, the discovery of a large impact basin that corresponds to the timing of the extinction.

Answer to Question 2

B