Grade 9 Earth Science

Choose the LAST STEP involve how geothermal energy generates electricity.

• Pumping the hot water from a geothermal resource.

• The generator produces electricity from spinning of the turbine.

• Electrical energy had been transferred to different circuits from the transformer.

• The excess water is being pumped back into the ground.

Which of the following statements is the FIRST STEP in generating an electricity from a geothermal energy?

• Pumping the hot water from a geothermal resource.

• The generator produces electricity from spinning of the turbine.

• Electrical energy had been transferred to different circuits from the transformer.

• The excess water is being pumped back into the ground.

Which of the following is the CORRECT statement about geothermal energy?

• Geothermal energy is the heat energy present on the surface of the Earth.

• Geothermal energy is the heat energy present in the interior of the Earth.

• Geothermal energy is the heat energy present on the surface of the ocean.

• Geothermal energy is the heat energy present in the outer space.

Which of the following statements is TRUE in harnessing volcanic energy?

• It can be and has been used as a source of energy.

• It is expensive and dangerous.

• It cannot be done in the Philippines.

• It is not a renewable source of energy.

This type of geothermal power plant is more common and requires lesser temperature than dry steam geothermal power plant.

• 
• 
• 
• none of the above

Volcanic eruption is often associated with negative effects. Which of the following statements describes the negative effects of volcanic eruption?

• Ash ejected by the volcano acts as a good fertilizer for soils.

• Volcanic eruptions cause health problems, loss of lives and properties.

• People became more creative by making earthenware out of the ash fall.

• Volcanoes attract many tourists, who enjoy the dramatic scenery that they produce.

Volcanic eruption can have both positive and negative effects. Which of the following statements below describes the positive effects of volcanic eruption?

• Produce very rich soils for farming.

• Destruction of properties.

• People are left homeless.

• Loss of lives.

Which of the following statements is CORRECT about magma and lava?

• Magma and lava are the same.

• Magma and lava are composed of entirely different materials.

• Magma refers to the molten materials that reached the Earth’s surface, while lava is the molten materials that are still inside the volcano.

• Magma refers to the molten materials that are still inside the volcano, while lava is the molten material that reached the Earth’s surface.

A type of eruption which is moderately explosive but intermittent, producing moderate ash columns.

• strombolian

• plinian

• phreatic

• vulcanian

Which type of volcano has broad base and steep slope, usually has a large crater at the top and formed by alternating layers of magma and ash?

• shield volcano

• lava dome

• cinder cone

• composite volcano