Besides silk, the Chinese also exported (sold) teas, salt, sugar, porcelain, and spices. Most of what was traded was expensive luxury goods. This was because it was a long trip and merchants didn't have a lot of room for goods. They imported, or bought, goods like cotton, ivory, wool, gold, and silver.
The Mayan writing system is different because, the ancient Maya system of writing has around 800 signs, and it's a mixture of logograms and phonetic signs.
