What explanations have been proposed for the mass extinction at ...

[ereecah]

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]

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

[ereecah]

Excellent

[aliotak]

Gracias!