Explanation

• If an opaque object is moved closer to the light source, the shadow gets bigger.
• This is because the light source appears larger and more intense from a closer distance, casting a larger shadow.

Explanation

The types of pollution are:

• Air Pollution: Harmful substances released into the air, like carbon monoxide and sulfur dioxide.
• Water Pollution: Contamination of water sources with pollutants such as industrial waste and sewage.
• Land Pollution: Degradation of land through activities like deforestation and improper waste disposal.

Explanation

 non-magnetic materials are examples

• Rubber
• plastic
• stainless steel
• feather
• paper
• mica
• gold
• Silver
• leather***

  ND18-1-2023

Explanation

• A pollutant is a substance or energy that causes pollution.
• It is an undesirable change to the environment.

Explanation

• The asteroid belt is a region of space where many small rocky bodies, called asteroids, orbit the Sun.
• It's also known as planetoids or minor planets.
• It is located between the orbits of Mars and Jupiter, spanning from about 2.2 to 3.2 astronomical units (AU) from the Sun.

Explanation

The Earth's Moon has considerably less mass than the Earth itself.

Not only is the Moon smaller than the Earth, but it is only about 60 percent as dense as Earth.

Thus, the gravitational attraction on the Moon is much less than it is here on Earth, and a person weighs less on the Moon.

ND20-1-2023

Explanation

The force of friction opposes the motion of an object, causing moving objects to lose energy and slow down.

***

ND18-1-2023

Explanation

Inclined planes are used to move heavy loads over vertical obstacles.

The inclined plane is one of the six classical simple machines defined by Renaissance scientists. 

ND20-1-2023

Explanation

• Meteoroids are small rocky, stony, and metallic debris that orbit the Sun in various orbits and speeds.
• When a meteoroid enters Earth's atmosphere, it becomes a meteor, also known as a shooting star or meteors or fireballs.
• If a meteor survives its passage through the atmosphere and lands on Earth, it is called a meteorite.

Explanation

• Neptune is the farthest planet.
• It was visited by the spacecraft Voyager 2.
• It's is a very windy place.
• It has six rings.
• It has 14 moons.