2025 Science Competition 1 (Study Tool)

Front

Which of the following is NOT the reason that we have day and night?

• A) The earth rotates

• B) The earth is constantly moving

• C) The sun moves away

• D) When the earth turns, we are not facing the sun.

Back

The sun moves away

Answer explanation

The reason we have day and night is due to the Earth's rotation and its position relative to the Sun. The statement 'The sun moves away' is incorrect, as the Sun's position does not cause day and night.

Front

Why can't we see the stars during the day?

Back

The sun is so bright that it stops us from seeing the stars.

Answer explanation

The correct answer is that the sun is so bright that it stops us from seeing the stars. During the day, the sunlight scatters in the atmosphere, making the stars too faint to be visible against the bright sky.

Front

What has the greatest effect in changing Florida's shoreline?

Back

waves

Answer explanation

Waves have the greatest effect on Florida's shoreline due to their constant action of erosion and deposition. They shape the coastline by wearing away land and transporting sand, making them the primary force in shoreline change.

Front

What generates heat and light?

Back

Sun

Answer explanation

The Sun generates heat and light through nuclear fusion, making it the only option among the choices that produces these forms of energy. The Earth, Moon, and Pluto do not generate their own heat and light.

Front

What was responsible for shaping the Grand Canyon?

Back

water

Answer explanation

The Grand Canyon was primarily shaped by water, specifically the Colorado River, which eroded the rock layers over millions of years, creating the canyon's depth and structure.

Front

What do both flies and frogs start off as?

Back

eggs

Answer explanation

Both flies and frogs begin their life cycles as eggs. The eggs hatch into larvae for flies and tadpoles for frogs, but the initial stage for both is the egg stage.

Front

Vick's experiment steps: 1. Take four identical plants. 2. Line them up in a row in a room with no natural light. 3. Place a lamp at the end of the row. 4. Observe the direction that the plant grows. What is Vick most likely testing?

Back

The effect that light has on the direction that a plant grows.

Answer explanation

Vick is testing how light affects plant growth direction, as he observes the plants' growth towards the lamp. The other options do not focus on the direction of growth, making this the most relevant choice.

Front

Which of the following is an example of a verified observation?

• A) Water is cold?

• B) With the right temperature, water in a pot on a stove will boil.

• C) Water is wet.

• D) Water tastes better than milk.

Back

With the right temperature, water in a pot on a stove will boil.

Answer explanation

The correct choice, 'With the right temperature, water in a pot on a stove will boil,' is a verified observation because it can be tested and confirmed through experimentation, unlike subjective statements.

Front

Kevin has just frozen some juice to make popsicles. What happens to the mass?

Back

The mass is still the same.

Answer explanation

The mass of the juice remains unchanged when it freezes into popsicles. Freezing changes the state of the substance from liquid to solid, but it does not alter the total mass.

Front

Which of the following is an example of a scientific investigation?

• A) weighing cocoa mix

• B) weighing coffee

• C) deciding whether or not cocoa mix tastes better than coffee

• D) testing if cocoa mix can dissolve in hot and cold water

Back

testing if cocoa mix can dissolve in hot and cold water

Answer explanation

The correct choice, 'testing if cocoa mix can dissolve in hot and cold water', is a scientific investigation because it involves a testable hypothesis and experimentation, unlike the other options which are not experimental.