However, not all parts of a rock undergo expansion and contraction at the same rate, resulting in the formation of cracks. Gradually, these cracks cause the rocks to break down into smaller pieces. With time, these smaller pieces convert into particles and form soil. Water plays an important role in soil formation. Water that gets collected in the cracks of rocks sometimes freezes, which helps in widening the cracks. Also, flowing river water helps in the wearing down of rocks over time, which results in the formation of soil.
Word problems can be classified into different categories. Understanding each category will give be an. advantage when trying to solve word problems. All problems in each category are solved the same way. With practice you will begin to see the similarities among word problems and be able to solve them easier. and faster. Age Problems. These types of problems ask you to figure out the age of different people by giving you different clues.
Note that the pronunciation examples are in American English accent. In the last lesson you will find American and British English examples. Another reason that English is difficult to speak is how words are stressed. For words of more than one syllable, some syllables are always accented or stressed more than others. Here is an example: 'carry'. In this word the first syllable 'car' is more stressed than 'ry'.