Rocks

Question 1

What is a sedimentary rock

Answer 1

• Sedimentary rocks are formed from pre-existing rocks or pieces of once-living organisms. They form from deposits that accumulate on the Earth’s surface. Sedimentary rocks often have distinctive layering.
  e.g. sandstone
  Features are:
  Different layers of rock

Question 2

What is an igneous rock

Answer 2

• Igneous rock is formed through the cooling and solidification of magma or lava.
  E.g. granite
  Features are:

Igneous rocks contain randomly arranged interlocking crystals.

Question 3

Metamorphic rock

Answer 3

• Metamorphic rocks arise from the transformation of existing rock to new types of rock, in a process called metamorphism.
  E.g. slate
  Features are:

They are crystalline and often have a squashed texture

Question 4

What is the rock cycle

Answer 4

Igneous rock —> weathering + erosion —> sediment —> compact or cementation —> sedimentary rock —> heat and pressure —> metamorphic rock —> molting —> magma —> cooling —> igneous rock

Question 5

What is the structure of the earth?

Answer 5

Crust-Earth’s crust is a thin shell on the outside of Earth

Mantle-the earths thickest layer

Outer core-The outer core, about 2,200 kilometers thick, is mostly composed of liquid iron and nickel

Inner core-The inner core is the fourth layer inside the Earth. It is a solid metallic ball made mainly of iron