Answer:
6.7 minutes
Explanation:
In a solid such as rock, the primary wave can travel at 5 km/sec; it would take 400 seconds, or about 6.7 minutes to travel 2,000 km.
Lungs have a pulmonary circulation
Answer:
C. 200 billion
Explanation:
The milky way galaxy is estimated that there is 200 billion stars
Answer:
B.
Explanation: Hope this helps! ^^
