lls of microscopic organisms accumulate on the ocean bed over time B1\n- Explains that analyzing the chemical composition or oxygen isotope ratios in these shells/sediment reveals past ocean temperatures or ice volume B1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"93bde65f-39d9-4fcf-b0d4-7f2baa32d4b2","revisionId":"5deec782-2bda-4c1a-87aa-61682c982203","questionNumber":null,"questionType":"LA","specification":"","difficulty":3,"difficultyBand":"medium","totalMarks":4,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"a9d848ef-4405-4c5b-8433-27b9e5a0d739","label":null,"content":"Outline two pieces of physical evidence that show global climates have changed in the past.","markscheme":"- Identifies a valid first piece of physical/natural evidence (e.g., ice cores, tree rings, fossil pollen, ocean sediments) B1\n- Explains how this first piece of evidence provides evidence of past climate change (e.g., ice cores contain trapped atmospheric gases that reveal past $\\text{CO}_2$ concentrations and temperatures) B1\n- Identifies a valid second piece of physical/natural evidence (e.g., tree rings, fossil pollen, ocean sediments) B1\n- Explains how this second piece of evidence provides evidence of past climate change (e.g., tree rings have varying widths that show year-on-year temperature and rainfall variations) B1","marks":4,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null}],"subjectCode":"gcse_geography__ocr_a","summaries":[{"id":"041aef2d-9b96-47c4-aac6-f1a6a95b1f27","difficultyBand":"easy","calculatorUse":null,"totalMarks":2},{"id":"0b4c0a4c-1b74-47cf-8891-107e0e0ab792","difficultyBand":"easy","calculatorUse":null,"totalMarks":2},{"id":"186795f0-e1a8-4302-a65a-e23b915b93e7","difficultyBand":"medium","calculatorUse":null,"totalMarks":4},{"id":"2a150851-1308-4bd3-9b1f-ce6210536824","difficultyBand":"easy","calculatorUse":null,"totalMarks":1},{"id":"3923cfd2-1de4-47d6-a14b-ea6509be0f54","difficultyBand":"medium","calculatorUse":null,"totalMarks":3},{"id":"49643831-f955-439d-b449-92460a77e336","difficultyBand":"medium","calculatorUse":null,"totalMarks":2},{"id":"49c71836-edbd-4e12-9799-54521e72e2f3","difficultyBand":"medium","calculatorUse":null,"totalMarks":2},{"id":"59c305de-9fbe-4751-a8d5-3d3c27dd6a90","difficultyBand":"medium","calculatorUse":null,"totalMarks":3},{"id":"5c61d827-83a1-49fa-84fa-0fcc433e7ffc","difficultyBand":"easy","calculatorUse":null,"totalMarks":2},{"id":"60f6fefc-0e6b-4ba3-bb51-98e5e8bc9cfe","difficultyBand":"easy","calculatorUse":null,"totalMarks":2},{"id":"621f4e5d-581a-4f26-997b-dbd9afc53993","difficultyBand":"medium","calculatorUse":null,"totalMarks":1},{"id":"75d8c5da-7db5-4512-852b-18ad26098dd9","difficultyBand":"hard","calculatorUse":null,"totalMarks":1},{"id":"763e88ce-6524-40d7-9305-0b6222bf5907","difficultyBand":"hard","calculatorUse":null,"totalMarks":8},{"id":"8694eeb9-38a2-4dd7-8f42-7e4a2e9a127e","difficultyBand":"medium","calculatorUse":null,"totalMarks":2},{"id":"8a79201f-4389-4072-b5ea-1d9056bd2c7f","difficultyBand":"easy","calculatorUse":null,"totalMarks":1},{"id":"93bde65f-39d9-4fcf-b0d4-7f2baa32d4b2","difficultyBand":"medium","calculatorUse":null,"totalMarks":4},{"id":"97f10247-12c5-49b9-96c1-d7c38644ce22","difficultyBand":"hard","calculatorUse":null,"totalMarks":8},{"id":"a1607cec-6c69-462f-893c-c78a6044f4f6","difficultyBand":"hard","calculatorUse":null,"totalMarks":6},{"id":"a4a5ab49-2902-48b6-8534-699ae346dff5","difficultyBand":"hard","calculatorUse":null,"totalMarks":6},{"id":"aa204a87-e9e8-4882-98fe-74f624fa47b4","difficultyBand":"easy","calculatorUse":null,"totalMarks":2},{"id":"c4471651-467b-4535-a176-db27959eef63","difficultyBand":"easy","calculatorUse":null,"totalMarks":2},{"id":"d6fd1af8-d51c-4682-a672-95be9306691c","difficultyBand":"easy","calculatorUse":null,"totalMarks":2},{"id":"e4c6afc8-8bb2-4ed7-a733-6

Climate change over time

Question 7

Climate change over time Questions

Climate change over time

Question 7

Climate change over time Questions