15.1 Oceans

What part of the Earth is the hottest?

• The middle- Equator

• Antarctica

• South Africa

• Sahara Desert

Answer explanation

The Equator is the hottest part of the Earth due to its direct exposure to the sun's rays throughout the year.

As you go deeper in the ocean, the water is warmer and less salty.

• True

• False

Answer explanation

As you go deeper in the ocean, the water is actually colder and saltier, not warmer and less salty. Therefore, the statement is false.

The amount of salt found in water is -

• temperature

• salinity

• pollution

• clarity

Answer explanation

The correct answer is salinity because the amount of salt found in water is measured by its salinity, not by temperature, pollution, or clarity.

Which has a higher density?

• Seawater

• Freshwater

Answer explanation

Seawater has a higher density compared to freshwater due to the presence of dissolved salts, minerals, and other substances, making it heavier.

Where is an object more likely to float?

• Seawater

• Freshwater

Answer explanation

An object is more likely to float in seawater compared to freshwater due to the higher density of seawater caused by the presence of dissolved salts.

As you travel deeper underwater, what happens?

• Temperature decreases and pressure decreases

• Temperature decreases and pressure increases

• Temperature increases and pressure increases

• Temperature increases and pressure decreases

Answer explanation

As you travel deeper underwater, temperature decreases due to the lack of sunlight, while pressure increases due to the weight of the water above pushing down.

Which order shows ocean layers from most shallow to deepest?

• Upper mixed layer → Main Thermocline → Deep Bottom Water

• Upper mixed layer → Deep Bottom Water → Main Thermocline

• Deep Bottom Water → Main Thermocline → Upper mixed layer

• Main Thermocline → Deep Bottom Water → Upper mixed layer

Answer explanation

The correct order of ocean layers from most shallow to deepest is Upper mixed layer → Main Thermocline → Deep Bottom Water.

How does salt get into the ocean?

• It comes from glaciers.

• It comes from the rain that runs off of rocks and land into rivers.

• Someone poured it in the ocean.

• It is made from sand.

Answer explanation

Salt gets into the ocean from the rain that runs off of rocks and land into rivers, carrying dissolved salts with it.

What is the most common type of salt in the ocean?

• Oxygen

• Calcium

• Carbon Dioxide

• Sodium Chloride

Answer explanation

Sodium Chloride is the most common type of salt in the ocean, making it the correct choice among the options provided.

Tags

NGSS.MS-PS1-1

T/F: Salinity varies slightly from one location to another as a result of the water cycle and climate variations.

• True

• False

Answer explanation

Salinity varies slightly from one location to another due to the water cycle and climate variations, making the statement true.