science test revision Flashcards
1
Q
rocks
A
solid mixtures of minerals
2
Q
properties of rocks
A
insoluble in water, poor electric and heat conductors, high melting points
3
Q
three types of rocks
A
sedimentary, igneous, metamorphic
4
Q
properties of sedimentary rock
A
porous, break easily, soft
5
Q
what do igneous rocks look like?
A
randomly arranged interlocking crystals
6
Q
how are metamorphic rocks formed
A
rocks underground get heated and put under pressure
7
Q
rock cycle
A
rocks are recycled due to weathering, erosion, earth movements
8
Q
how are earth layers different
A
mantle is hotter than crust and molten
9
Q
why do tectonic plates move
A
heat rises and falls in mantle causing convection currents
10
Q
tectonic plates
A
earth’s crust is split up into separate plates
11
Q
volcano
A
mountain that has lava coming from underground magma chamber
