WarmUp 46 What is a galaxy millions or

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

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

Warm-Up # 48 What evidence is there for the Big Bang Theory? ? ? 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 #49 The first man made object ever sent into space was in 1957 when the Russian satellite named Sputnik was launched.

WARM-UP #50 How old is the universe?

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

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

February 6, 2014 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.

WARM Up # 53 Who proposed theory of continental drift? Alfred Wegener proposed theory of continental drift in 1912. He was a German scientist.

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

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

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? Seafloor spreading B. Evidence that tectonic plates are being created younger at divergent boundaries is that _______ rocks are found at the mid-ocean ridges and older _______rocks are found further away. C. What is the name of the one large supercontinent that existed millions of years ago? 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.