Astronomy Unit 1 Exam

Which layer of the Earth is composed mostly of granite rock and has a density of 2.7 g/cm3?

What is the name of the supercontinent proposed by Alfred Wegener in 1915?

Which type of crust is denser and sinks underneath the less dense crust?

What is the main factor that causes denser minerals to be pulled towards the Earth's core?

True or false: Africa's west coast and South America's east coast fit together like a jigsaw puzzle?

True or false: Fossils of reptiles and plants were found on multiple continents?

True or false: Glacial evidence was found on South America, Africa/Madagascar, India, Antarctica, and Australia?

Tectonic plates are large areas of Earth’s ______ that are in motion relative to one another

Earthquakes are evidence that Earth is in constant ______

3 types of plate ______ Convergent = collide, Divergent = divide, Transform = slide past each other

Which type of rock is formed at mid-ocean ridges and records the Earth's magnetic orientation?

What does the symmetrical magnetic striping pattern in mid-ocean ridge crust indicate?

How many major eons are there?

What are the three major eons broken into?

True or false: The planetesimal hypothesis suggests that Earth formed from smaller rocky bodies called planetesimals that collided and merged.

True or false: The giant impact theory suggests that Earth formed from the debris created by a massive collision between a Mars-sized object and the young Earth.

True or false: The nebular hypothesis suggests that Earth and the other terrestrial planets formed from solid particles in the planetary disk around the young Sun.

Which celestial body is intermediate in size between planetesimals and fully-formed planets?

What causes the dust and gas from a protoplanetary disk to come together?

When can a protoplanet be considered a planet?

Which stage of formation involves the movement of tectonic plates and the effects of atmospheric movements and water?

During which stage of formation does the bombardment of planetesimals continue and craters form?

Which stage of formation involves the bursting of lava through the planet's crust and the smoothing of craters?

What does the word "differentiation" mean when we are discussing Earth's early formation?

Alfred Wegener proposed his theory of continental drift in what year _______?

While working as a meteorologist Alfred Wegener spent a lot of time in Antarctica near the South Pole.

The Appalachian mountains in US and UK appear to have once been connected.

True or false: Harry Hess proposed the theory of seafloor spreading?

True or false: Seafloor spreading occurs at mid-ocean ridges?

Please give a brief summary in 5-10 sentences about the astronomer or astronomers that you created your project about. Please indicate the time period they were from and a few of their notable discoveries in Astronomy during your summary.