Sound
What does « to vibrate » mean?
To move backwards and forwards
What is an echo?
A reflection of a sound wave
What is the mantle of the Earth made of?
Molten (hot liquid) rock that can flow
Where do most geologic events take place?
at plate boundaries
What is an opaque object?
An object that will not let light rays pass through.
In loudness and pitch
How can sounds vary?
What do bats use echoes for?
To find insects for food and navigate in the dark
What’s the name of the scientist that suggested the idea of continental drift?
Alfred Wegener
What does « moving together, moving apart and sliding past » describe?
the movement of tectonic plates
Why should you never look directly at the Sun even when there is an eclipse?
It can cause permanent damage to your eyes. (Retina)
About 343 meters/second
What’s the speed of sound in air?
Wool blankets, soft curtains and thick carpets
What can be used inside a room to avoid echoes?
Magma
What are the tectonic plates moving on?
What is a dormant volcano?
A volcano that has not erupted for a long time.
A solar eclipse
What happens when the Moon comes between the Sun and the Earth?
A crying baby
What’s an example for a sound with a high pitch?
Large flat walls
What kind of surface gives a lot of echoes?
The types of rock on the different continents match up where they fit together.
What was one evidence for Alfred Wegeners idea of continental drift?
Fold mountains
What is produced when tectonic plates move togehter and the rocks crumple and fold upwards?
A lunar eclipse
What happens when the Earth comes between the Sun and the Moon?
In a sound wave
How does sound travel from a vibrating object to our ears?
Echography
What is the name for echoes being used to make images from inside our bodies?
About 4 cm each year
How quickly are the tectonic plates moving?
The size of the Earthquake
What does the « Earthquake magnitude » mean?
At full moon
When can a lunar eclipse happen?
Gas, liquid or solid
What can sound waves travel through?
Melon
What is the name of the organ that dolphins use for echolocation
Plate boundary
What is the name of the places where the tectonic plates meet?
The Pacific Ring of Fire
How are. The Plate boundaries around the edge of the Pacific Ocean, where there are many geological changes, called?
The orbit of the moon is tilted slightly
Why don’t lunar eclipses happen every month?