Chem 3

Question 1

What is the composition of the earths atmosphere

Answer 1

78% nitrogen, 21% oxygen, and one percent other gases

Question 2

What is the structure of the earth

Answer 2

made up of three different layers: the crust, the mantle and the core. the outside layer of the earth and is made of solid rock, mostly basalt and granite. There are two types of crust; oceanic and continental. Oceanic crust is denser and thinner and mainly com​posed of basalt.

Question 3

What is sedimentary rock

Answer 3

formed from pre-existing rocks or pieces of once-living organisms

Question 4

What is metamorphic rock

Answer 4

changed into a more compact form by the action of pressure, heat, and water

Question 5

What is an igneous rock

Answer 5

form when hot, molten rock crystallizes and solidifies

Question 6

The seven steps of the rock cycle are

Answer 6

weathering, erosion and transport, deposition of sediment, burial and compaction, melting, uplift and deformation and metamorphism

Question 7

What is atmospheric pollution

Answer 7

the presence of undesirable matters in the air in large quantities, which have harmful effects