Science Form 1, 2 & 3 Notes
Question 1:What are the effects of deforestation? Answer:Deforestation can cause lack of oxygen production and carbon dioxide content in the air to increase. This will cause global warming as carbon dioxide is a greenhouse gas that can trap the heat from the Sun. Lack of oxygen content will also reduce oxygen for respiration. Deforestation can … Read more
Question 1:When did fish first appear on Earth? Answer:500 million years ago Question 2:Between insects and flowering plants, which appeared on Earth first? Answer:Insects Question 3:When did seaweeds first appear on Earth? Answer:1000 million years ago
Question 1:List three examples of geohazards. Answer:Landslide, tsunami, earthquake Question 2:What are the impacts of geohazards to humans? Answer:Destruction of properties, loss of life, diseases, famine. Question 3:State two devices invented by scientists to predict occurrences of geohazards. Answer:Seismograph to detect earthquake, radar to detect tsunami.
Question 1:What are exogenic and endogenic processes? Answer:Exogenic process – a process that occurs on Earth’s surfaceEndogenic process – a process that is caused from within the Earth. Question 2:What are the agents causing erosion? Answer:Water, wind and waves Question 3:What is Plate Tectonics theory? Answer:Earth’s crust is divided into several plates. These plates always … Read more
Question 1:How are sedimentary rocks, igneous rocks and metamorphic rocks formed? Explain. Answer:Igneous rocks are formed when magma from volcano eruptions cools when it rises to the surface. Sedimentary rocks are formed from various rock fragmentation processes such as weathering and erosion. It is then carried by the river to the sea and deposited there. … Read more
Question 1:Earth consist of four main spheres which are ___________ , ____________ , ______________ and ______________ . Answer:hydrosphere, biosphere, geosphere, and atmosphere Question 2:A fish catches its prey using light. In which zone of the ocean can this fish be found? Why? Answer:Dark zone. Here, fish has shimmering bodies or are able to glow in … Read more