2.1 & 2.2 (Intro to Ocean Water, Salinity, and Density)

Sophia, Benjamin, and Ava are on a beach trip. They are curious about the composition of the seawater they are swimming in. What is it mainly composed of?

• Mainly sodium and chloride

• Mainly potassium and calcium

• Mainly magnesium and sulfate

• Mainly nitrogen and phosphorus

Tags

NGSS.MS-PS1-1

William, Mia, and Jackson are planning a science experiment to observe the freezing point of salty water. According to their hypothesis, at what temperature will the salty water start to freeze?

• 0°C (32°F)

• -1.8°C

• Below -10°C

• Above 10°C

Tags

NGSS.MS-PS3-4

Luna, Elijah, and Arjun are building an ice sculpture for a school project. They need to calculate the weight of the sculpture, but first, they need to know the density of ice. What is it?

• 0.9 g/cm³

• 1.0 g/cm³

• 1.1 g/cm³

• 1.2 g/cm³

Mason, Nora, and Mia went on a field trip to the beach. They noticed the water was not clear. According to their science teacher, what is the main factor that affects the turbidity in such coastal waters?

• Plankton

• Sediment

• Bacteria

• Decaying plants

How is the salt in the ocean water measured in? 

• Salty
• Salts
• Salt
• Salinity

What effects salinity? 

• Evaporation rates
• runoff
• Both evaporation rates and runoff

Tags

NGSS.MS-ESS2-4

a layer in a body of water in which water temperature drops with increased depth faster than it does in other areas

• thermocline
• incline
• saline
• decline

What is the formula for density?

• density = mass x volume
• density = mass / volume
• density = mass + volume
• density = mass - volume

Frank has an eraser. It has a mass of 4g, and a volume of 2cm³. What is its density?

• 8 g/cm³
• 2 g/cm³
• 1/2 g/cm³
• 24 g/cm³

Why do objects sink or float in H₂O?

• Because their densities are higher or lower than compared to water

• Because their densities are using gravity to pull down

• Because their densities are heavier or lighter

• Because their mass and volumes are equal