Author Question: What evidence led scientists to believe that waves travel at a greater velocity inside Earth? A) ... (Read 114 times)

brutforce

  • Hero Member
  • *****
  • Posts: 540
What evidence led scientists to believe that waves travel at a greater velocity inside Earth?
 
  A) Studies of earthquake signals via sensors located deep inside drill holes prove it.
  B) Refraction of energy waves is most efficient at shallower depths.
  C) Refraction of energy waves is most efficient along short paths.
  D) Average velocity is faster when the seismograph is farther from the focus of the earthquake.

Question 2

What was the reason for installing a worldwide network of seismometers in the 1950s and 1960s?
 
  A) to save human lives by predicting volcanic eruptions and earthquakes
  B) to study plate tectonic theory
  C) to monitor underground nuclear bomb testing
  D) to study mine blasts



gstein359

  • Sr. Member
  • ****
  • Posts: 293
Answer to Question 1

Answer: D

Answer to Question 2

Answer: C



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

Did you know?

The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

Did you know?

Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

Did you know?

On average, the stomach produces 2 L of hydrochloric acid per day.

For a complete list of videos, visit our video library