Exploring Science and Nature

What are the three main types of renewable energy sources?

• Biomass, coal, natural gas

• Geothermal energy, fossil fuels, nuclear energy

• Solar energy, wind energy, hydropower

• Tidal energy, oil, propane

How does the human circulatory system function?

• The human circulatory system is responsible for producing hormones.

• The human circulatory system primarily functions to digest food.

• The human circulatory system filters toxins from the air.

• The human circulatory system transports blood, delivering oxygen and nutrients to tissues and removing waste products.

What is Newton's first law of motion?

• An object will change its direction only when a force is applied.

• An object will accelerate indefinitely without any force.

• An object will remain at rest or in uniform motion unless acted upon by an external force.

• An object will only move if a force is applied continuously.

Which layer of the Earth is composed of solid rock?

• Inner core

• Outer core

• Crust

• Mantle

What is the primary source of energy for the Earth?

• The Moon

• The Sun

• Nuclear fusion

• Geothermal energy

Name the organ responsible for filtering blood in the human body.

• Kidneys

• Pancreas

• Liver

• Spleen

What is the formula for calculating speed?

• Speed = Distance + Time

• Speed = Distance - Time

• Speed = Time / Distance

• Speed = Distance / Time

Which continent is known as the 'Dark Continent'?

• Asia

• Africa

• Antarctica

• Europe

What is the greenhouse effect?

• The greenhouse effect is the warming of Earth's surface due to the trapping of heat by greenhouse gases in the atmosphere.

• The greenhouse effect is caused by the depletion of ozone in the stratosphere.

• The greenhouse effect refers to the increase in Earth's gravity due to human activities.

• The greenhouse effect is the cooling of Earth's surface due to the reflection of sunlight.

How many bones are in the adult human body?

• 210

• 204

• 206

• 198