Syria has a mostly desert climate with hot, dry summers and mild, rainy winters along the coast. The terrain includes narrow coastal plains, mountains in the west, and long flat deserts with little rainfall. Natural resources include petroleum, minerals, and hydropower. Problems include deforestation, soil erosion, water pollution, and inadequate water. The population speaks Arabic primarily and is majority Sunni Muslim, with Christian and other religious minorities. Key industries are petroleum, textiles, food processing, and agriculture, and Syria exports oil, agricultural products, and imports machinery, chemicals, and manufactured goods.