Where is the Mediterranean region?
A macro-region is a big area whose land, climate and life share the same pattern. The Mediterranean region is the land around the Mediterranean Sea in southern Europe, north Africa and western Asia. We study it by its nature (plates, climate, plants), not by country borders.
Complex plate situation and earthquakes
The Earth's outer shell is broken into big slabs called plates. Here the African plate moves slowly north (about 2 to 3 cm a year) and presses on the Eurasian plate. Between them are also small plates and pieces. The result is a tangled, cracked zone.
- Stress builds up, then breaks suddenly: an earthquake.
- Where one plate sinks under another, rock melts and can rise: volcanoes (like Etna and Vesuvius).
- The pushing also lifts mountains and leaves a steep coast.
Mediterranean climate: wet and dry season
In summer a belt of high pressure sits over the region. Air sinks, clouds do not form, and it is hot and dry. In winter this belt moves away and rain-bringing winds arrive from the west. So:
- Summer: hot, sunny, almost no rain.
- Winter: mild and wet.
Most places get roughly 400 to 900 mm of rain a year, nearly all in the cool months. This is the opposite of many climates, where summer is the rainy season.
Vegetation and farming types
Plants must survive a dry summer. Natural plants are hard-leaved evergreens: small, thick, waxy leaves lose less water, and deep roots reach far down. Examples: olive, cork oak, rosemary, thyme.
Farming follows the same pattern:
- Tree crops: olives, grapes (vines), figs, citrus.
- Winter grain: wheat and barley grow in the wet months and are harvested before the dry heat.
- Irrigated crops: vegetables and fruit need water in summer, so farmers bring it by canals, pipes or wells.
- Terraces turn steep hills into flat steps that hold soil and water.
Land degradation
Land degradation means land becomes less able to grow plants. Here it happens because:
- Heavy winter storms hit a dry, hard, bare soil. Water runs off fast and carries the soil: erosion.
- Forests were cut for wood and fields, and fires burn the dry bushes.
- Too many sheep and goats eat the plants.
- Pumping too much groundwater near the coast lets salty sea water seep in: salinisation.
Roots, terraces, and keeping some plant cover protect the soil.
Water balance and sustainable water use
A water balance compares the water coming in (rain, rivers, groundwater) with the water used or lost (people, farms, evaporation).
Balance = supply - use. A negative number is a deficit.
The problem here is timing: supply is highest in winter, but demand is highest in summer, when farms and tourists need the most. Sustainable use means taking no more than nature refills. Ways: dams to store winter rain, drip irrigation, fixing leaking pipes, reusing treated water, choosing crops that need less water.
Hazard management
We cannot stop plates, but we can lower the harm (risk).
- Earthquakes: strict building rules, strong frames, maps of danger zones, drills, early warning.
- Wildfires: clear dry brush, fire breaks, watch towers, rules about fire in summer.
- Floods after storms: keep plant cover, terraces, river channels, not building on flood plains.
- Drought: store water, save water, share water fairly.
Try it: wet winter, dry summer
Step 6 has two sliders. Put the season on summer and the use at 50%: is the blue tank (water in) taller than the orange one (water used)? Now move the season to winter. What changes? Then find a use level that keeps the balance in summer.
Key formulas and definitions
- Water balance = supply - use (negative = deficit)
- Average per month = total rain / number of months
Worked examples
1. A town gets 600 mm of water a year and uses 750 mm. Find the balance.
Balance = 600 - 750 = -150 mm. It is a deficit of 150 mm, so the town takes water from stores or groundwater.
2. About 450 mm of rain falls in the 5 wet months. What is the average per wet month?
450 / 5 = 90 mm a month. In the 7 dry months the average is close to zero.
3. Why do farmers build terraces on a Mediterranean hill?
The steps are flat. Rain stays on them longer and soaks in, and the soil is held by stone walls. So less soil is washed away and crops get more water.
Common mistakes
- Thinking that the Mediterranean is rainy in summer. It is dry in summer and wet in winter.
- Thinking that earthquakes there have no cause. They come from the African and Eurasian plates pushing together.
- Mixing up total rain with timing. A region can have enough rain in a year and still be short of water in summer.
- Thinking that land degradation is only from nature. Cutting trees, fire and over-grazing add a lot.