Grassland

For some reason, there is Earth like grass and animals around.

Some tiles have Resources.

Alien Forest

These forests are filled with strange alien organisms. Planet's radiation makes it impossible for Earthly organisms to survive here. Cities can work these tiles only when tech Organic Structures is known. Units of classes Earthly and Amphibious cannot enter these tiles. Inventing Alien Rights gives +1 production bonus to Alien Forest tiles. Max size for cities placed on Alien Forest tiles is one lower than usual.

Some tiles have Huge Plants.

Radiating Rocks

Planet's radiation makes it impossible for Earth organisms to survive here. Cities can work these tiles only when tech Organic Structures is known. Units of classes Earthly and Amphibious cannot enter these tiles. Max size for cities placed on Radiating Rocks tiles is one lower than usual.

Some tiles have Glowing Rocks.

Hills

Hills just like on Earth.

Some tiles have Alien Mines.

Thick Mountains

What are these mountains made of?!? Diamond drill makes no scratch on them. Burrowing units are unable to burrow through these mountains.

Some tiles have Alien Mines.

Ocean

This is normal oceanic terrain.

Some tiles have Fish.

Boiling Ocean

This ocean is boiling. No ship without special equipment, i.e. those in class Sea, can enter. Cities can work these tiles only when tech Thermal Module is known.

Some tiles have Thermal Vents and others Fish.