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What is the difference between the substances represented by the symbols Co and CO?

• They are two different ways to represent the element cobalt.

• One is the symbol for an element, and one is a formula for a compound.

• Co represents the element cobalt, and CO represents the element copper.

• They represent two substances, each made up of two elements.

Tags

NGSS.MS-PS1-1

The Colorado River started eroding the Grand Canyon 6 million years ago. Of the layers shown at location X, which two layers did the Colorado River erode away first?

• Redwall Limestone and Supai Group

• Kaibab Formation and Toroweap Formation

• Bright Angel Shale and Tapeats Sandstone

• All layers are eroded at the same time by the Colorado River.

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

What is the chemical formula for water?

Tags

NGSS.MS-PS1-1

Which planet is known as the Red Planet?

• Earth

• Mars

• Jupiter

• Venus

What is the process by which plants make their food using sunlight?

• Photosynthesis

• Respiration

• Transpiration

• Fermentation

Tags

NGSS.MS-LS1-6

What is the powerhouse of the cell?

• Nucleus

• Ribosome

• Mitochondria

• Chloroplast

Tags

NGSS.MS-LS1-2

What is the acceleration due to gravity on Earth?

Which gas is most abundant in the Earth's atmosphere?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Hydrogen

What is the boiling point of water at sea level?

• 100°C

• 90°C

• 110°C

• 120°C

What is the hardest natural substance on Earth?

• Gold

• Iron

• Diamond

• Silver