sedimentary rocks

Question 1

two sedimentary rocks

Answer 1

limestone - the burren, co. clare
sandstone - caha mountains, co. cork

Question 2

what are sedimentary rocks made from

Answer 2

the build up of layers of sediment in rivers, seas and lakes

Question 3

because they are made from the build up of sediment, what do they contain

Answer 3

layers called strata

Question 4

what is the junction between each layer known as

Answer 4

bedding plane

Question 5

how is sediment turned into rock

Answer 5

process of lithification

Question 6

what happens during lithification

Answer 6

the great weight of the layers of sediment compacts the grains of rock together

Question 7

what occurs when under pressure

Answer 7

minerals such as calcite and silica leak from the grains and stick them together to form solid rock

Question 8

what can sedimentary rocks be

Answer 8

organic, inorganic, chemical

Question 9

what is organic sedmintary rocks made from

Answer 9

remains of dead plants and animals on the sea floor

Question 10

what occurs during lithification

Answer 10

the great weight of sediment causes calcite from shells and skeletons cement the grains together forming solid rock

Question 11

what is formed this way

Answer 11

limestone and chalk

Question 12

how do inorganic sedimentary rocks from

Answer 12

when particles of igneous, metapmorhpic or sedimentary rocks build up under water and are cemented together by silica

Question 13

what forms this way

Answer 13

sandstone and mudstone

Question 14

what are some sedimentary rocks

Answer 14

porous(sandstone)

Question 15

what does porous mean

Answer 15

they have spaces between the grains which can hold water, oil and gas

Question 16

what are the other sedimentary rocks

Answer 16

pervious

Question 17

what does pervious mean

Answer 17

they do not contain pores so water, oil and gas pass through the joints and bedding planes instead e.g. limestone

Question 18

how are chemically sedimentary rocks formed

Answer 18

evaporation of seawater from enclosed seas or lakes

Question 19

what happens when seawater evaporates

Answer 19

the dissolved substances it contains such as gypsum and salt are left behind as soil rock

Question 20

what are these rocks known as

Answer 20

evaporites

Question 21

when is gypsum deposited

Answer 21

when 37% of the eater has evaporated

Question 22

when is rock salt deposited

Answer 22

when 93% of the water has gone

Question 23

where can rock salt be found

Answer 23

carrickfergus, co.antrim

Question 24

where can gypsum be found

Answer 24

kings court, co.cavan

Question 25

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