Question 1
What was true of African building materials during the first millennium C.E.?
a. Stone was increasingly used in West Africa during in the first millennium C.E.
b. The only construction material used during that period was dried mud.
c. Mosques were always constructed of wood.
d. The heavy use of mortar was predominant in buildings constructed at Great Zimbabwe.
e. Metal became an important building material as early as 1000 B.C.E.
Question 2
The three laws of motion that govern the planetary bodies and the objects on earth were explained by
a. Isaac Newton.
b. Galileo Galilei.
c. Ptolemy.
d. Nicolaus Copernicus.
e. Johannes Kepler.
The Sun as it appears from the surface of Earth during the middle of the day
Apparent motion of Alpha Centauri relative to Beta Centauri
Kuiper Belt Objects
Children with autism generally prefer interacting with objects over people.
Ocean cover most of Earth’s surface
When viewed from the Earth, Venus subtends an angle of about 1 arcminute (1/60°) when it is at ...