Top Tips

1
Top Tips!

• New words Almost every geography module has its
  specialist vocabulary. Keep a record of new
  words and the check the spelling!
• How long? How long is a piece of string!
  Generally try to keep them to 1-2 sides of A4.
  Or 1-5 of the text length fro longer pieces.
• Sources Keep an accurate record of all research
  sources.
• Diagrams Using flow or spider diagrams really
  help you remember the information.
• Check and share notes with friends Everyone has
  different ideas about what is important, so
  comparing summary notes with a friend will expand
  your understanding.

2
Homework

• Due in next week Tuesday.
• Take notes from the Bill Bryson chapter on the
  Troposphere.
• Highlight the key points as you read the text.
  Go through the information again and condense it
  into concise notes.

3
Test Feedback

• The test questions were all taken from the
  textbook, which you were given to conduct your
  research.
• As I read through the answers, highlight the
  relevant parts of the text. This is the
  information, which you should definitely learn
  for your AS exam!

4
Wild Weather Video

• Make brief notes.

5
What causes depressions?

• Tuesday 20th September 2005

6
Learning Objective

• By the end of the lesson, I will understand what
  causes depressions.

7
Formation of depressions

• Depressions are low pressure systems (lows) that
  occur in mid-latitudes and are associated with
  the meeting of cold and warm air masses.
• N.B. They were formerly called cyclones, but this
  term should be avoided and reserved for the
  topical systems that we refer to as hurricanes.

8

• Depressions form a semi-permanent boundary
  between cold polar air and warmer air from the
  tropics. This boundary is known as the polar
  front (refer back to the global circulation
  model).
• A front is the boundary between two air masses
  and reflects the nature of the air behind rather
  than forward of it.

9
Weather associated with depressions

• Look at the cross-section on a depression. Cut
  out the labels. Where do you think they would go
  on the diagram?
• Use the information in figure 9.44 (page 215) to
  annotate the cross-section of a depression, using
  the information below it.
• Extension Complete the worksheet.

10
Weather associated with depressions

• Warm fronts bring rain for many hours.
• The cold front is much steeper (because the cold
  air undercuts the warm sector) and the associated
  weather forms a narrow band which passes over an
  observer more quickly.
• Eventually because the cold front is moving
  faster than the warm front, it catches up with
  the warm front creating an occluded front.

11
Lifecycle of a depression

• Cut out the diagrams in figure 214 and stick them
  on a sheet of paper.
• Use the information on pages 214-216 to explain
  the diagrams.

12
Plenary

• Write two statements about a depression one
  which is true and one which is false.