- •Lesson 2 Grammar: the Present Indefinite Tense Where to find rocks?
- •Where do rocks come from?
- •Lesson 3 differences between rocks Rock textures
- •Lesson 4 Grammar: the Past Indefinite Tense
- •Investigating how porous rocks are
- •Acid rain (1)
- •Acid rain (2)
- •Lesson 6 Grammar: The Future Indefinite Tense the effect of temperature change
- •By daily expansion and contraction.
- •By freeze-thaw damage
- •Transportation of fragments
- •Lesson 8 Grammar: Future actions in when-, if- clauses Flooding and sediment formation
- •Lesson 9 Transport of sediments
- •Lesson 10 Grammar: The plural of nouns
- •Pollution
- •Lesson11
- •Lesson 12
- •Lesson 13 (revision)
- •Erosion of rocks
Lesson 12
Match the keywords from this unit to their definitions.
POROUS |
A gas found naturally in the atmosphere which contributes to acid rain.
|
NON-POROUS |
Weathering due to water expanding as it freezes.
|
INTERLOCKING
|
Consist of carbon and oxygen. Examples include limestone. |
CARBON DIOXODE
|
The depositing of sediment as it loses energy during transportation. |
SULPHUR DIOXIDE
|
Fitting tightly together with no spaces between the grains. |
CARBONATES
|
The general look and feel of a type of rock. |
“ONION SKIN” WEATHERING
|
Filled with air spaces and therefore able to absorb water. |
FREEZE-THAW WEATHERING
|
The name given to rain with pH less than 7. |
EROSION
|
The movement of rock fragments and grains by streams and rivers. |
SEDIMENTATION
|
Gases produced by car exhausts which contribute to acid rain. |
TEXTURE
|
Weathering due to the difference between day and night temperatures. |
NITROGEN OXIDES
|
A gas produced by heavy industry which contributes to acid rain. |
ACID RAIN
|
The general name given to the gradual wearing away of rocks. |
TRANSPORTATION |
Very few air spaces and therefore not able to absorb much water. |
Lesson 13 (revision)
Exercise 1. Fill in the gaps with appropriate words.
Erosion of rocks
Rain is usually slightly …………………… due to the presence of ……………….. …………………… which dissolves in it as it falls. Other gases such as ……………………. …………………….. , produced as a by-product of industrial processes, and ………………………. ……………………… from car exhausts, also dissolve in rain and make it much more ………………….. . Acid rain reacts with ………………………… to produce …………………… ……………………. . This gradually wears away this type of rock. Rocks can also be eroded by ………………. And …………………. Due to the difference between daytime and night-time temperatures, and also by the expansion of ……………….. as it …………………… . Small pieces of rock are then ………………….. by rivers, and really small grains get as far as the sea where they become deposited as …………………………. . Some rock fragments never get near to a river but just fall to the bottom of a slope to form ……………………… .