There is a lot of witnesses that saw aliens, but not much proof at all.
but no one knows if there is aliens or not...
There is no proof whatsoever that aliens exist.
(Note: "What else could it be ?" is not proof.)
There is a lot of people willing to say that they saw aliens,
but nobody with a story that holds up.
Corroborating it with other pieces of evidence
Breaking coal into pieces is a physical change because it does not alter the chemical composition of the coal. The coal remains composed of the same elements before and after being broken into pieces.
To provide a concise answer, could you please specify the context or topic for which you need four pieces of evidence? This will help me tailor the response accurately.
Physical.
The video was recorded in Bluff Creek, Ca by Roger Patterson in 1967 while on horseback. This famous footage is thought of as one of the best pieces of evidence to support the existence of Bigfoot(Sasquatch) in the USA.
evidence
Physical.
PHYSICAL EVIDENCE IS; is any evidence introduced in the form of a physical object, intended to prove a fact in issue based on its demonstrable physical characteristics. Physical evidence can conceivably include all or part of any object. The physical evidence might include http://wiki.answers.com/wiki/DNA left by the attacker on the victim's body, the body itself, the http://wiki.answers.com/wiki/Weapon used, pieces of carpet spattered with http://wiki.answers.com/wiki/Blood, or casts of footprints or tire prints found at the scene of the crime. EXAMPLES ARE; -THE BODY ITSELF -ANY WEAPON FOUND AT THE SCENE - ANY FOOTPRINTS, FINGERPRINTS, TYRE TRACKS, BLOOD SPLATTERS AND ANYTHING THE SUSPECT MAY HAVE LEFT BEHIND SUCH AS AN ITEM OF CLOTHING ETC. PHYSICAL EVIDENCE IS ANYTHING THAT CAN BE PRODUCED IN COURT THAT CAN AFFECTIVELY BACK UP THE FORENSIC TEAM.
global warming?
Evidence for Pangaea includes the fit of the continents, where coastlines match up like puzzle pieces, as well as similarities in rock formations, fossils, and mountain ranges across different continents. Additionally, paleoclimate data, such as glacial deposits in tropical regions, supports the idea of a supercontinent in the past.
It is a physical phenomenon.
It is physical. The tooth is broken into smaller pieces, but the pieces are still made of the same substances.