7th, 7.2

A missing rock layer or a disturbance in a rock layer is caused by

• The law of superposition
• Volcanoes
• Index fossils
• An unconformity

What is the difference between relative dating and absolute dating?

• Relative dating provides the exact age of a rock, while absolute dating provides a rough estimate of the rock’s age
• Relative dating can estimate a rock’s age only in relation to other objects or events, while absolute dating can provide an actual age
• Relative dating uses several types of radioactive decay to determine an object’s relative age, while absolute dating only uses the halflife of uranium 235
• Relative dating and absolute dating can only determine the rock’s age in relation to other objects or events

This rock was heated and put under pressure over time. What type of rock is this?

• Sedimentary
• Igneous
• Metamorphic

Erosion is...

• materials begin moved across the Earth's surface by water and wind
• materials deposited into a new location as sediment
• rocks and other materials being broken down both physically and chemically

How are sedimentary rocks formed?

• cooling
• erosion
• heat and pressure
• compacting and cementing

Which layer would be the oldest?

• siltstone
• sandstone
• conglomerate
• mudstone

Deposition is...

• using too much fertilizer
• materials deposited into a new location as sediment
• rocks and materials being broken down
• materials being moved by water and wind

Which of these often occur as the Earth's crustal plates move?

• earthquakes
• floods
• tornadoes
• hurricanes

Mountains are formed by...

• wind slowly building up rocks
• erosion
• lowering of the sea level
• folding and faulting of the Earth's crust

Igneous rock may be broken into tiny pieces and changed into what?

• metamorphic rock
• sedimentary rock