Match the explorers with their contributions to the geographical study of the Earth.

Matching of Explorers and Their Contributions:

• Ермак Тимофеевич - положил начало географическим открытиям в Сибири
• Христофор Колумб - открытие Америки

Brief Explanation:

The task is to match the given explorers with their significant geographical discoveries or contributions. Ermak Timofeevich is known for the exploration and conquest of Siberia, marking the beginning of geographical discoveries in that region. Christopher Columbus is famous for his voyages across the Atlantic Ocean, leading to the European discovery of the Americas.

Answer: Ермак Тимофеевич - положил начало географическим открытиям в Сибири; Христофор Колумб - открытие Америки.