Question : Heat from the sun reaches the Earth by:

Option 1: reflection

Option 2: conduction

Option 3: radiation

Option 4: convection

Question : Select the option that expresses the given sentence in active voice.

Most of Earth's surface is covered by water.

Option 1: Water is covering most of Earth's surface.

Option 2: Water has been covering most of Earth's surface.

Option 3: Water covers most of Earth's surface.

Option 4: Water has covered most of Earth's surface.

Question : A person can jump higher on the moon's surface than on the earth because : 

Option 1: The moon's surface is rough

Option 2: the acceleration due to gravity is smaller than that on the earth

Option 3: the moon is cooler than earth

Option 4: the moon has no atmosphere

Question : What are the main energy sources for Earth's internal heat engine?

Option 1: Radiogenic heat and oceanic tide heat

Option 2: The heat from volcanoes and solar heat

Option 3: Solar heat and oceanic tide heat

Option 4: Radiogenic heat and primordial heat

Question : What powers the Earth's internal heat engine?

Option 1: Solar Energy

Option 2: Volcanoes

Option 3: Radioactive energy

Option 4: Tides