Geologic Time 12.1-12.3

Front

What is a Divergent Boundary?

Back

A divergent boundary is a tectonic plate boundary where two plates move away from each other, often resulting in the formation of new crust as magma rises to the surface.

Front

Which layer in a geological photograph typically represents the oldest layer?

Back

The oldest layer is usually at the bottom of the sequence, often referred to as layer 1 in diagrams.

Front

What type of rock is most likely to contain fossils?

Back

Sedimentary rock is the type of rock that can contain fossils, as it forms from the accumulation of sediment and organic material.

Front

What does the law of crosscutting state about the age of geological features?

Back

The law of crosscutting states that a geological feature (like a fault) is younger than the layers it cuts through.

Front

How do sedimentary rocks typically form?

Back

Sedimentary rocks usually form from the accumulation and compaction of sediments, often in horizontal layers.

Front

What is the significance of the principle of superposition in geology?

Back

The principle of superposition states that in an undeformed sequence of sedimentary rocks, the oldest layers are at the bottom and the youngest are at the top.

Front

What is a fault in geological terms?

Back

A fault is a fracture or zone of fractures between two blocks of rock, which can result in the displacement of rock layers.

Front

What are the three main types of rock?

Back

The three main types of rock are igneous, sedimentary, and metamorphic.

Front

How do igneous rocks form?

Back

Igneous rocks form from the cooling and solidification of molten rock (magma or lava).

Front

What is the difference between relative age and absolute age in geology?

Back

Relative age refers to the age of a rock or feature in relation to other rocks or features, while absolute age is the actual age in years.