constructed response using race
strategy
what are tsunamis and how are they formed?
r
restate the question
a
answer the question
c
cite evidence from the text
e
explain your answer
tsunamis
tsunamis are large waves that are usually caused as the aftermath of an earthquake or volcanic eruption. the abrupt movement in the ocean floor, causes waves to form in the middle of the ocean. these are known as “seismic waves.” as the wave travels towards shore, it begins to gain massive height. most tsunamis occur in the pacific ocean. this is due to the fact that it is known as earth’s “ring of fire,” or the area where most tectonic shifts occur such as volcanic eruptions and earthquakes. once the lowest part of the wave hits, it creates a vacuum effect. when this happens, the sea water retreats back, exposing the bare sea floor. this is warning that the tsunami will hit shore.
highlight in green the part of the text that states the definition of a tsunami.
highlight in red the part of the text that describes what “seismic waves” are.
highlight the part of the text that describes what happens when the lowest part of the wave hits.
highlight in blue the part of the text that explains why most tsunamis occur in the pacific ocean.

Question

Accepted Answer

# Brief Explanations:
1.  **Green (Definition of a tsunami):** Identified the core description of what a tsunami is from the text.
2.  **Red (Seismic waves definition):** Located the text that links seismic waves to tsunami formation.
3.  **Yellow (Lowest wave part impact):** Found the details of what occurs when the lowest section of the tsunami wave hits.
4.  **Blue (Pacific Ocean tsunami reason):** Pinpointed the text explaining why most tsunamis occur in the Pacific Ocean.

# Answer:
1.  Green highlight: *"Tsunamis are large waves that are usually caused as the aftermath of an earthquake or volcanic eruption."*
2.  Red highlight: *"The abrupt movement in the ocean floor, causes waves to form in the middle of the ocean. These are known as 'seismic waves.'"*
3.  Yellow highlight: *"Once the lowest part of the wave hits, it creates a vacuum effect. When this happens, the sea water retreats back, exposing the bare sea floor."*
4.  Blue highlight: *"This is due to the fact that it is known as Earth's 'ring of Fire,' or the area where most tectonic shifts occur such as volcanic eruptions and earthquakes."*

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### R.A.C.E. Strategy Completion:
# Restate the Question:
What are tsunamis, and how do they form?
# Answer the Question:
Tsunamis are large ocean waves, most often formed by underwater tectonic activity like earthquakes or volcanic eruptions in the Pacific Ocean's "Ring of Fire"; as they approach shore, their lowest part can cause sea water to retreat before the main wave hits.
# Cite Evidence from the text:
- "Tsunamis are large waves that are usually caused as the aftermath of an earthquake or volcanic eruption."
- "Most tsunamis occur in the Pacific Ocean. This is due to the fact that it is known as Earth's 'ring of Fire,' or the area where most tectonic shifts occur such as volcanic eruptions and earthquakes."
- "Once the lowest part of the wave hits, it creates a vacuum effect. When this happens, the sea water retreats back, exposing the bare sea floor."
# Explain Your Answer:
Tsunamis begin when sudden underwater events (like earthquakes from tectonic shifts in the Pacific's "Ring of Fire") displace ocean water, creating seismic waves. These waves grow in height as they move toward shore, and the arrival of the wave's lowest section pulls water away from the coast, exposing the seafloor as a warning before the full tsunami strikes.

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