Earth is made mostly of metals and rocks. Where did this material come from?
A) It was produced in the Big Bang.
B) It was created by chemical reactions in interstellar space.
C) It was produced by the nuclear fusion in stars that made the heavy elements.
D) It was made by our Sun.
E) It was made by nuclear fission of uranium and other radioactive materials.
C
You might also like to view...
When humans get cold, they shiver in order to increase their body temperature. Which of the key properties of life is this an example of?
A) growth and development B) reproduction C) order D) response to environment
A large volume of the solar system's space is occupied by
a. meteors. b. micrometeoroids. c. asteroids. d. comets
Which of the following diagrams best represents the energy diagram of a semiconductor?
A light emitting diode emits light of approximate wavelength 670 nm. What is the band gap?
A) 1.86 eV B) 4.14 eV C) 1.80 eV D) 3.72 eV E) 2.70 eV