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A sound that is repeated is referred to as an echo. This generally happens in a cavern or valley, where the sound bounces from a far surface and comes back. When sounds are repeated in writing, it's called alliteration. For instance, "Sally sold seashells by the seashore".
Sentence: A Seismograph is a machine used to measure the severity of earthquakes.
The focal length of the mirror is a property of the geometry of the mirror. It doesn'tdepend on the wavelength of radiation that's incident upon it. For that matter, themirror could be wrapped in thick black flannel, sealed in an airtight lead box, andstored in a pitch-dark underground cavern, without a single photon hitting it, andit would still have a focal length.
A magma chamber.
A magma chamber.
It is a massive magma chamber to what has been called a supervolcano that lies beneath much of the park.
Sinkhole and a cavern
two huge mountains called chaka cavern
A cavern is a large cave. Generally a cave is considered to be a cavern if it is large and extends a long way underground. Caverns often have other geological features within them such as stalactites or stalagmites. The exploration of caves and caverns is known as speleology.
I'll explore this cavern when I have a flashlight.
Cavern is a noun.
The suffix for cavern is -ous, as in cavernous.
Space Cavern was created in 1980.
Space Cavern happened in 2600.
Cavern of the Fear was created in 2002.