The angle between the horizon and the sun is
a. large
b. small
at both sunrise and sunset

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j