Which describes the waves formed by tsunamis?
a. they cause large waves in open ocean but small ones near the shore.
b. they cause large waves both in open ocean and near the shore.
c. they cause small waves both in open ocean and near the shore.
d. they cause small waves in the open ocean but large ones near the shore
d. they cause small waves in the open ocean but large ones near the shore
To determine the correct answer, we need to understand the nature of tsunamis.
Tsunamis are a series of ocean waves that are caused by large-scale disturbances, such as earthquakes, volcanic eruptions, or underwater landslides. These disturbances displace a significant amount of water, which then generates waves that can propagate across entire ocean basins.
Given this information, let's analyze each option:
a. They cause large waves in open ocean but small ones near the shore.
This option suggests that tsunamis generate large waves in the open ocean, but these waves become smaller as they approach the shore. This statement contradicts the behavior of tsunamis since they tend to increase in height and impact as they near the coastline.
b. They cause large waves both in open ocean and near the shore.
This option states that tsunamis produce large waves both in the open ocean and near the shore. This aligns with the behavior of tsunamis, as they can cause significant waves throughout their entire journey.
c. They cause small waves both in open ocean and near the shore.
This option suggests that tsunamis generate small waves both in the open ocean and near the shore. Again, this contradicts the actual behavior of tsunamis, which are known for their ability to generate enormous waves as they approach shallow waters.
d. They cause small waves in the open ocean but large ones near the shore.
This option states that tsunamis generate small waves in the open ocean but produce larger waves near the shore. This aligns with the behavior of tsunamis, which typically start as small waves in deep water but gain height and destructive power as they enter shallow coastal areas.
Based on this analysis, the correct answer is:
d. They cause small waves in the open ocean but large ones near the shore.