How did these unusual Martian small balls emerge? Thousands of unusual small gray balls consisting of iron were found on the landing ground of the robot-landrover Opportunity on Mars. They look like blackberries. The Opportumity landrover found a hole on the surface of Mars with a large quantity of balls. This place, called "blackberry plate" was found on the 48th Martian day. The Center's answer: The balls are magma surges from the depths. The form is connected with the impact of temperature condition.