We are interested in the weather because it{{U}} (21) {{/U}}us so directly—what we wear,{{U}} (22) {{/U}}we do, and even how we feel. Geographers, however, are{{U}} (23) {{/U}}interested in climate than in weather. Climate is the pattern of all the weather conditions over a long period of time. Generally{{U}} (24) {{/U}}, climate{{U}} (25) {{/U}}to these normal weather conditions, not{{U}} (26) {{/U}}daily or yearly changes.
Climate, like weather, changes{{U}} (27) {{/U}}time. It is true{{U}} (28) {{/U}}these changes{{U}} (29) {{/U}}a long time, but not as long as we might expect. Records show that over the centuries large portions of the earth have experienced great changes{{U}} (30) {{/U}}climate.