Science

Question 1

Oceanic crust

Answer 1

Basalt, solid, 6-7 km thick

Question 2

Continental crust

Answer 2

Granite, solid, 20-80 km thick

Question 3

Lithosphere

Answer 3

Rocks, minerals, soils, solid, 100 km depth

Question 4

Asthenosphere

Answer 4

Rock, solid, 100km to 700 km depth

Question 5

Inner core

Answer 5

Solid and liquid, metal, iron and nickel, 1200 km radius

Question 6

Outer core

Answer 6

Iron and nickel, liquid, 2200 km thick

Question 7

Direct evidence for how to know what is inside earth

Answer 7

Rock samples

Question 8

Indirect evidence how to know what is inside earth

Answer 8

Seismic waves

Question 9

Why earth core hot

Answer 9

Decay of radioactive elements, pressure and heat

Question 10

How do convection currents in the mantle affect earth surface

Answer 10

Affect temp and the hotness of something

Question 11

Theory of continental drift who proposed it

Answer 11

Alfred wegener, all continents were super continent, called pangeae

Question 12

Evidence for Alfred wegener

Answer 12

Drilling samples, South America and Africa look like they fit each other, puzzle pieces

Question 13

Why people don’t believe Alfred

Answer 13

No evidence not good enough

Question 14

Theory of plate tectonics

Answer 14

Dan McKenzie, He suggested there are two layers in the mantle, each of which are in motion, controlling the movement and behaviour of the tectonic plates above

Question 15

1. Feature form to stop seafloor from expanding
2. 3 evidence that seafloor is spreading

Answer 15

1. Convection currents
2. Pillow shaped rocks
   Magnetized stripes
   Deep ocean trenches