14. About how long ago was Earth formed
A. 4.5 million years
C. 45 million years
B. 4.5 billion years
D. None of the above
15. Oceanic crust is
and
dense than continental crust.
A. wider, less
B. thinner, more
C. thinner, less
D. wider, more
16. Wind, solar and water are examples of resources
A. nonrenewable
C. fossil fuels
B. budding
D. renewable
17. Which cycle illustrates the path of water through the environment?
A Nitrogen cycle
C. Carbon cycle
B. Phosphorus cycle
D. Hydrologic cycle
18. What is a resource that can be replaced relatively quickly by natural
processes?
A. nonrenewable
C. depleted resources
B. material resources
D.renewable resource
19. Environmental Scientists study interactions between_
A. animals and their environment.
B. humans and their environments.
C. humans and animals.
D. animals and their habitats
20. Which of the following is the most abundant element in a Star?
A. Helium
C. Sulphur
B. Carbon
D. Hydrogen
21. Which of the following is described as a cloud of gas and dust?
A. Proto star
C. Black Hole
B. Nebula
D. Red Giant
22. What will be the next fate of a red giant after it explodes?
A. It will become a planetary nebula.
B. It will become a Black Hole.
C. It will go back as a proto star.
D. It will remain the same.
23. What do you call to the explosion of a red supergiant star?
A Black Hole
C. Supernova
B. Planetary Nebula
D. White dwarf
24. This stage of a star exerts such a string gravitational pull that no light
escapes called as alan
A Neutron Star
C. Black Dwarf
B. Protostar
D. Black Hole
25. It is the earliest stage of a star's life.
A. Neutron Star
C. Black Dwarf
B. Protostar
D. Black Hole​