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3. Comprehension check.

1. What is the difference among the terms weathering, erosion, transport and deposition?

2. What does the term mechanical weathering imply?

3. List five processes that cause mechanical weathering.

4. How can thermal expansion establish forces that could fracture a rock?

5. Does mechanical weathering alter the chemical composition of minerals?

6. What is called talus slopes? How do they form?

4. Word-building.

Translate the following words:

Contract – contraction – contracted; expand – expansion – expanded; abrade – abraded – abrasion; fluctuate – fluctuated - fluctuation; combine – combined – combination; concentrate – concentrated – concentration; solve – soluble – solution; dissolve – dissolving – dissolved; corrosion – corrosive; effect – effective – effectiveness – effectively; crystal – crystalline – crystallize – crystallization.

5. Read and translate the following word combinations.

1) impacts creating the craters; granitic pluton solidifying from magma; atmosphere and water weathering and eroding the surface; tectonic forces raising the plutons; rocks falling from the cliffs; collision shaping many rocks; particles ranging in size;

2) overlying rocks; underlying rocks; diminishing pressure; freezing water; thawing water; colliding particles; rapidly changing temperature; heating-cooling cycles; the resulting forces; occurring commonly forest fires.

6 .Lexical exercises.

a) Give English equivalents:

механическое и химическое выветривание; разложение (разрушение) пород; движение разрушенных пород; тысячелетие; захороненные породы; неокатанные породы; текущая вода; термальное (тепловое) расширение и сжатие; видоизменять земную поверхность; быть подверженным коррозии; изменять химический состав пород и минералов; отличаться как физически, так и химически от изначального материала; шлифовать породу; на глубине 15 км; давление веса надлежащей породы; чистая (без примесей) вода

b) Complete the sentences:

  1. The decomposition and disintegration of rocks and minerals at the Earth’s surface is . . . .

  2. The removal of weathered rocks and minerals by moving water, wind, glaciers, and gravity is . . . .

  3. If water accumulates in a crack and then freezes, its expansion pushes the rock apart in a process called . . . .

  4. Large piles of loose angular rocks are called . . . .

  5. The mechanical wearing and grinding of rock surfaces by friction and impact is called . . . .

P a r t II

1. Read and translate the following word combinations.

Common substance; rare in moist environment; hydrogen or hydroxyl ion concentration; acid solution; much more corrosive than pure water; electrically charged hydrogen; bubbles of carbon dioxide gas; slightly acidic; the only rock-forming silicate mineral; unaltered quartz grains; oxidation reaction; acids and bases; solid; liquid; chemical; reversible.