24) The Earth\'s present atmosphere is composed almost entirely of A) nitrogen,

Question

24) The Earth's present atmosphere is composed almost entirely of A) nitrogen, oxygen. and water vapor. B) nitrogen, oxygen. and carbon dioxide C) oxygen. and carbon dioxide. D) hydrogen, helium, and water Vapor. 25) If any mass is shrunk to the size of the event horizon, that object will be a A) neutron star B) black hole C) brown dwarf D) white dwarf 26) What are the two things that scientist think defines life. A) Eating and reproduction. B) Eating and breathing C) Growing and enlarging D) Reproduction and evolution. 27) Most biological evidence shows that A) every spices has a separate origin. B) humans have a distinct origin. C) all life on Earth has a single origin. D) all life on Earth comes from Mars 28) The modern theory that explains universe is called A) The Steady State Theory B) The Cosmic Expansion Theory C) The Big Bang Theory D) Black Hole evaporation Theory 29) The discovery that the universe is expanding came a quit a shock. Until Hubble discovered the Cosmological Red Shift the universe was thought to be Infinitely old and Infinite in extent. What discovery by Wilson and Penzias forced most Astronomers to accept that the Big Bang Theory was correct? A) Discovery of the Cosmic Background Radiation. B) Discovery that the speed of light is a constant C) Discovery of Black Holes. 30) A first magnitude star is A) the same brightness as a 6 magnitude star. B) dimmer than a 6h magnitude star C) brighter than a 6h magnitude star. D) is brighter than the Sun.

Explanation / Answer

24) A) Nitrogen ,Oxygen and water vapor

The earth's present atmosphere is composed almost entirely of 4 gases

25) B) Black hole

Event horizon is the size to which an object needs to be reduced to attract light.At the event horizon the object will be a black hole.

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.