Activity 1: Choose Correctly Read each item carefully. Write the letter of the correct answer on the blank. 1. The shaking of the earth's crust is called a. earthquake b. tsunami c. erosion d. landslide 2. When scientists observe the effects of the earthquake, they refer to a. epicenter b. intensity c. magnitude d. surface waves 3. What instrument measures the magnitude of an earthquake? 4. Which of the following are the effects of earthquake and volcanic a. seismogram b. seismograph c. barograph d. scale eruptions? 1. Loss of lives III. Fire II. Destruction of properties a. I, II, III b. I, II, IV c. I, III, IV IV. Land formation d. |,||,|||,|V| 5. What do you call the molten rocks that reach the Earth's surface? a. magma b. lava c. basalt d. obsidian​