Worksheets › Class 9 › Earth as a System: Energy, Matter, and Life
Class 9 Earth as a System: Energy, Matter, and Life worksheet
CBSE Science. Sunlight and albedo, land and sea heating, water, carbon, oxygen and nitrogen cycles, human impact. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
Of every 100 units of sunlight reaching the Earth, 26 are reflected back to space and 23 are absorbed by the atmosphere. How many are absorbed by the surface?
- 77
- 74
- 49
- 51
Answer
(d) 51
100 − 26 − 23
- 2.
Nitrification is a step in:
- the nitrogen cycle
- the water cycle
- the carbon and oxygen cycles
- the rock cycle
Answer
(a) the nitrogen cycle
bacteria turn ammonia into nitrates
- 3.
Almost all the energy that drives the Earth’s weather and life comes from:
- volcanoes
- the Moon
- the Sun
- the Earth’s core
Answer
(c) the Sun
Section B · short answer
- 4.
28 mm of rain falls on a 470 m² school playground. How many litres of water is that? (1 mm on 1 m² is 1 litre.)
Answer
13,160 L
470 × 28
- 5.
Give two differences between weather and climate.
Answer
Weather is the day-to-day state of the air in a place; climate is the average weather of a place over many years.
Section C · long answer
- 6.
Describe the carbon cycle.
Answer
Plants take in carbon dioxide for photosynthesis and store carbon in food. Animals eat plants. Respiration of all living things, decay by decomposers and burning of fuels return carbon dioxide to the air. Some carbon is stored for long times in fossil fuels and in the oceans.
Fresh sheets for your child
In the app, every Earth as a System: Energy, Matter, and Life sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.