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www.reference.com/article/causes-echoes-23ef478eefebb49

An echo is caused when sound waves bounce off of a surface and travel back to the ears. Echoes commonly occur when loud sounds are emitted into an empty room or down a well. The echo occurs when sound is reflected off water in the well or walls in rooms.

www.reference.com/article/echoes-created-fafd0d1c0acfcadf

Echoes work through the reflection of sound waves. When a person shouts into a well or canyon, and they hear an echo, it is because the sound waves reflect from the canyon wall or the bottom of the well and travel back to the person's ears.

www.reference.com/article/echo-test-show-3b2075424246ede2

An echo test, also known as an echocardiography or diagnostic cardiac ultrasound, shows all of the details of a person's heart. This includes the structure, size, movements, valves, septum and the various walls of the heart, according to The National Heart, Lung and Blood Institute.

www.reference.com/article/echo-produced-1cfae95feb4f7502

Echoes are created by sound waves being reflected off of a large obstacle. Conditions have to be just right for the echo to be heard as a separate sound.

www.reference.com/article/echo-occur-60d3710e1fc2cab2

An echo occurs when a sound wave reflects back towards its source after hitting a hard surface. Although the surface may absorb some of the sound, the remaining sound that is not absorbed continues moving, creating additional echoes by bouncing off surrounding objects until the sound is completely a

www.reference.com/article/replacement-parts-echo-da632417f4918ed4

As of 2016, find replacement parts for an Echo at Echo-USA.com, HomeDepot.com and RepairClinic.com. The Echo company recommends that owners perform maintenance annually by replacing parts such as the fuel and air filters and spark plugs.

www.reference.com/world-view/heart-echo-test-1ab83380264ae08

A heart echo test, or echocardiography exam, is a painless test that examines the structure and function of the heart, according to the National Institutes of Health. This test may involve the injection of saline or a specific dye into the patient's veins to showcase his heart more easily.

www.reference.com/world-view/echo-test-performed-898d84c66697d3ea

An echo test, or echocardiogram, is an ultrasound test used to view moving pictures of the heart on a screen, states WebMD. During this test, high-pitched sound waves are sent through a transducer, a device that picks up sound waves as they echo off the various parts of the heart.

www.reference.com/article/can-person-hear-sound-echoes-216ab9e35d7f623

An echo can be heard in a cave when a sound reflects off surrounding walls and then is heard again. It is also possible to hear an echo in an empty room, in a mountain valley, under a bridge or by calling down into a well.

www.reference.com/article/echo-stress-test-like-4d416daca72a63dc

An echo stress test, or stress echocardiography, is a simple test that utilizes ultrasound imaging to view a patient's heart after he exercises. The test is ordered by doctors to determine if a patient has proper blood flow in his heart, according to MedlinePlus.