3. Bloodroot. This plant, which is sometimes referred to as redroot, is ground in eastern woodlands. It is often found near mayapple or Solomonâs Seal. Bloodroot has rounded green leaves and flowers with tiny white petals. However, it is the root part of the plant that is used for medicinal purposes.
If you shout hello, the sound may bounce back at you from a large object. You then hear your own voice coming back. Your returning voice is called an echo. Radar and sonar are electronic devices that use the principle of an echo to detect and locate objects. Both radar and sonar locate objects from the echo of a signal that is bounced off the object. Radar uses radio waves, which are a type of electromagnetic energy. Sonar uses the echo principle by sending out sound waves underwater or through the human body to locate objects. Sound waves are a type of acoustic energy. Because of the different type of energy used in radar and sonar, each has its own applications.
man made satellites are used to orbit around the earth. these satellites collect information that can be used for communication, defense, weather forecasting, research etc..