To acknowledge both conceptual and situational factors, childrens' understanding of the Earth was considered from three angles: 1, the perspective as the physical point or direction from which something is seen or depicted; 2. conceptual frameworks; 3. the relevance of explanations in a situation. Fourteen children were interviewed individually in front of a poster of a satellite photo of the Earth. The interviews were semi-structured and focused on what the children understood was depicted in the poster and if they had seen the Earth. The effect of choice of perspective was demonstrated by children who only talked about how the Earth could be seen from space. The need to relate different conceptual frameworks became apparent with children, who meant that the Earth was situated in the direction of the sky. Different understandings of the relevance of an explanation were detected when the interviewer talked from the perspective in the room, but children talked about the perspective in the present poster. The results indicate that not only both conceptual frameworks and understanding of perspectives play a part when students encounter questions related to the concept of Earth, but also the students' judgments of the relevance of different explanations in a situation.