Warm-Up # 46 What is a galaxy? millions or billions of stars, gas and dust, held together by gravitational attraction.

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Presentation transcript:

Warm-Up # 46 What is a galaxy? millions or billions of stars, gas and dust, held together by gravitational attraction

What have many irregular shaped galaxies been involved in? COLLISION with Another galaxy WARM-UP #47

1)Background radiation. This radiation, a type of energy, is believed to be left over from the actual Big Bang. 2)The expansion of the universe. This means the distance between galaxies is increasing over time. Warm-Up # 48 What evidence is there for the Big Bang Theory???

The first man made object ever sent into space was in 1957 when the Russian satellite named Sputnik was launched. WARM-UP #49

How old is the universe? WARM-UP #50

ABOUT 14 BILLION YEARS Warm-Up # 50 How old is the universe?

Why are the spectra of galaxies shifted toward the red end? They show redshift because they are moving away from us. WARM-UP #51

WARM-UP # 52 What is ONE piece of evidence that the continents were once all joined together? You know two – fit together like a puzzle and matching fossil evidence. February 6, 2014

WARM Up # 53 Who proposed the theory of continental drift? Alfred Wegener proposed the theory of continental drift in He was a German scientist.

What is the theory of seafloor spreading and what scientist developed this theory? Warm-Up # 54 Scientists found that the youngest rocks are located at the mid-ocean ridges. It was discovered by Henry Hess.

Warm-Up # 56 Seafloor spreading (Hess) and continental drift (Wegner) What are the two theories that when combined make up the theory of plate tectonics?

Warm-Up # 55 Label the three major layers of earth on this diagram:

Warm-Up # 57 A. What theory of explains why the seafloor has both trenches and mid-ocean ridges? B. Evidence that tectonic plates are being created at divergent boundaries is that _______ rocks are found at the mid-ocean ridges and ______________rocks are found further away. C. What is the name of the one large supercontinent that existed millions of years ago? Seafloor spreading younger older Pangea

Warm-Up # 58 What is the name of the most famous transform fault (plate boundary) in the world? San Andreas Where is it? California What is a transform fault? A plate boundary where the plates grind past each other (not toward or away from each other).

February 20 Warm-Up # 59 What is hot, melted rock under the surface of the Earth known as??? MAGMA. Hot, melted rock on the surface of Earth is known as LAVA

February 20 Warm-Up # 60 What are climate clues???? Wegner found fossils of the same organism but in very different climates – like a tropical plant in a polar region or a glacial (glacier) deposit in a tropical region.