Answer:
1. 1795, that's when they were also invented
2. a gray crystalline allotropic form of carbon which occurs as a mineral in some rocks and can be made from coke. It is used as a solid lubricant, in pencils, and as a moderator in nuclear reactors.
3.The second graphite grading scale is known as the HB scal
4. As the concentration of hydrogen ions in a solution increase, the more acidic the solution becomes. ... Thus, as the hydrogen ion concentration increases hydroxide ion concentration falls, and vice versa.
Answer:
the material of a work of art.
OR in painting: the substance that is added to a color in order to help application
Explanation:
Answer:
A. Megaliths
Explanation:
<u>Megaliths are pre-historic architectural elements. They are placed like the monuments, sometimes connected with the place of the burial.</u> Megaliths could be placed in a group (circle, wall, etc), or be just a simple stone making the monument.
<u>The exact intend for the monument is still the cause of debate among the archeologis</u>t, though it is evident some are placed as the marker for the burial ground. Sometimes, they would even be made as a coffin to hold the bodies, and sometimes they would just mark the place of the grave. Yet, not all megaliths are tombs – there are many of them all over the world, and their function likely differs.
Probably the most known megalith is Stonehenge in the UK, which is Europe's most preserved group of megaliths in a circular form/
