DepEd MELC reviewer for Grade 9 Science, Quarter 3. Master the concepts, tables, and common-mistake warnings below.
Volcanoes and Geothermal Energy
Heat from inside the Earth drives volcanic activity and can be harnessed as geothermal energy — a renewable source the Philippines uses widely.
Climate and Its Factors
| Factor | Effect on climate |
|---|---|
| Latitude | Nearer equator = warmer |
| Altitude | Higher = cooler |
| Distance from sea | Coastal = milder |
Global Warming
Greenhouse gases (CO₂, methane) trap heat, raising global temperatures.
Climate = long-term pattern; weather = day-to-day. Global warming changes climate over decades.
Renewable Energy
The Philippines is a top producer of geothermal energy. Renewables (geothermal, solar, wind, hydro) reduce greenhouse gases versus fossil fuels.
Renewable = naturally replenished. Fossil fuels are finite and release CO₂.
Before your test, make sure you can confidently do each of the following:
- Explain and apply Volcanoes and Geothermal Energy.
- Explain and apply Climate and Its Factors.
- Explain and apply Global Warming.
- Explain and apply Renewable Energy.
Re-read any section above where you hesitate, then try the worked example again without looking.