Answers PBCSD_Grade_Forgiveness_2001310_Earth Space Science_S2_2019Relative Dating

Geologic Time Answers

0 verified answers

Which best explains how gravity contributes to the formation of layers in protoplanets?

Gravity attracts materials and causes compaction, which produces heat and leads to the melting, sinking, and rising of materials.

Gravity causes materials to undergo radioactive decay, which produces heat and leads to the melting, sinking, and rising of materials.

Gravity absorbs heat, which cools materials and causes them to sink and rise.

Gravity releases heat into space, which cools materials and causes them to sink and rise.

Free Preview

Study the graph about oxygen content of Earth’s atmosphere.Which describes oxygen content as Earth evolved over time?

Oxygen levels sharply declined about 400 million years ago.

Oxygen levels stay above 15 percent starting 200 million years ago

Oxygen levels remain below 5 percent starting 1000 million years ago.

Oxygen levels raise significantly between 1000 and 700 million years ago.

Why is radioactive dating important when approximating the age of Earth?

Scientists can identify different life forms using index fossil records.

Scientists can examine how temperature changes within Earth’s interior.

Scientists can determine the order of when rocks formed on Earth.

Scientists can analyze changes in chemical concentration of atmospheric gases.

What was the significance of collisions of dust, rock, and ice during Earth’s formation?

to modify the density of materials present on Earth

to facilitate heat absorption from the surrounding space

to blow away a strong burst of particles from the first atmosphere

to harden materials to form different parts of Earth’s layers

The table shows index fossils.

Life forms existed during the Cambrian period.

Similar fossil species formed after the Devonian period.

This fossil species first appeared during the Cenozoic era.

Different life forms were surviving during Precambrian time.

What information does the geologic time scale provide about Earth's history?

Reasons why organisms change into different species

Locations where ancient organisms lived

How plants and animals interact in ecosystems

The sequence and timing of major events in Earth's history

Which unit of geologic time is the oldest?

Cenozoic

Mesozoic

Ordovician

Precambrian

Which period is older than the Triassic period?

Cambrian

Cretaceous

Jurassic

Paleogene

What is the purpose of a geological time scale ?

It used to predict natural disaters throughout Earth’s history.

It is used to present the correct sequence of events in the Earth’s history.

It is used to determine the absolute dates in years for different periods.

It used to create a naming system for flora and fauna.

Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?

The materials undergo decay when they collide, which results in the heating and subsequent melting and rising of materials.

The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.

The materials undergo decay when they collide, which results in the cooling and subsequent hardening and sinking of materials.

The collisions absorb heat, which results in the cooling and subsequent hardening and rising of materials.

Did you find these answers helpful?

Geologic Time Answers

More from this Course

TRY EDGENUITY HACKS