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- The Unseen Giants Of The Ocean Main Idea And Central Idea Informational Texts (grade 6)
The Unseen Giants of the Ocean - Main Idea and Central Idea - Informational Texts (Grade 6)
Passage
•
English
•
6th Grade
•
Practice Problem
•
Hard
Angela Lock
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the central idea of this passage?
Tsunamis are only dangerous in Japan where the name comes from.
Tsunamis are complex and powerful natural events, but understanding them helps people stay safe.
Tsunamis travel as fast as jet planes and are impossible to detect before they strike the coast.
The only cause of a tsunami is a large earthquake under the sea.
Answer explanation
This option best summarizes the entire passage, which explains what tsunamis are, how they form and travel, and how scientific understanding and warning systems can promote safety.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which detail from the passage explains why a tsunami might not be noticed in the deep ocean?
It travels over 500 miles per hour.
The wave height might only be a few feet tall.
It is a series of waves called a wave train.
It is caused by the movement of tectonic plates.
Answer explanation
The passage explains that despite its speed, the wave is not very high in deep water, which is why it could pass by a ship unnoticed.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
According to the passage, what is the most common cause of a tsunami?
Strong winds during a hurricane
The tide pulling the ocean back
A powerful undersea earthquake
The speed of a jet plane
Answer explanation
The passage directly states this fact.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the name of the detection system that scientists use to find tsunamis in the open ocean?
Tectonic Plate System
Wave Train Buoy
Harbor Wave Network
DART system
Answer explanation
The passage explicitly names the DART system as the network of buoys used for tsunami detection.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which statement best summarizes what happens when a tsunami approaches land?
It speeds up and gets smaller.
It stops completely and the water recedes.
It slows down and the water piles up into a taller wave.
It creates an earthquake on the coast.
Answer explanation
The passage describes that in shallower water, the wave slows down and its energy compresses, causing the wave height to increase dramatically.
6.
MATCH QUESTION
1 min • 1 pt
Match each term from the passage with its correct description.
The distance between two wave crests
Wavelength
Giant pieces of Earth's crust
Tsunami
A series of waves meaning 'harbor wave'
Tectonic plates
A network of buoys that detects tsunamis
DART system
Answer explanation
The passage defines 'tsunami' as 'harbor wave', 'tectonic plates' as giant pieces of Earth's crust, 'wavelength' as the distance between crests, and the 'DART system' as the detection network.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What critical warning sign of an approaching tsunami is mentioned in the passage?
The sound of a jet plane
A sudden drop in air pressure
The sky turning dark
The ocean pulling back from the shore
Answer explanation
The text identifies the ocean receding and exposing the sea floor as a key warning sign.
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