_____ is/are measured in half lives.

A ____ is the whole left behind in the rock after an organism's hard part has dissolved.

Preserved animal tracks are called ______ fossils

Fossils up to 75,000 years old can be dated with _______.

An nonconformity is a _______ of rock

Fossils are the _______, imprints, or traces of once living organisms preserved in rock.

A measure of the amount of light received on Earth is a star's

A red shift in the spectrum of the light from an object indicates the object is moving _______ you.

The variable that you change in an experiment is called the ______.

The ____ is the standard by which your results can be compared

The variable being measured is the __________

Variables that do not change in an experiment are the _____ .

Conclusions to scienctific experiments should be based on ______ .

The relationship between the metric units is very important. Choose which of the following is correct.

The _____ is used to measure temperature .

Which of the following laboratory equipment measures volume.

The liter is a unit of

The gram is a unit of

The meter is a unit of

Which of the following laboratory equipment is used to determine the mass of an object?

The _____ states that between 15 and 20 billion years ago, the universe began expanding out of an enormous explosion.

Two stars orbit each other in a(n) ____ star system.

Prominences and flares on the Sun are related to sunspots because they are all caused by ______.

______ are patterns of stars in the sky.

The coolest stars inthe sky are _____ in color

A star begins as a ______, a large cloud of gas and dust.

Dark, cooler areas on the Sun's surface are called ________.

The Sun produces energy by fusing hydrogen atoms into _____ atoms in its core.

A main sequence star become a _____ after it uses up the hydrogen in its core.

About 90% of the stars in space are _____ stars

The hottest stars in space are ______ in color.

The distance to nearby stars can be measured by using _____.

A measure of the amount of light given off by a star is its -______

The positions of the constellations appear to change throughout the year because ______.

How many centimeters are in 1.25 meters?

The Hawaiian Islands are huge _____ mountains that sit on the ocean floor.

How many liters are in 1325 milliliters

How many grams are in 2.0 kilograms?

The crystals that form slowly in cooled magma produce ____ minerals grains.

Lava that cools quickly forms _____rocks

Igneous rocks that form _____ the surface are intrusive

Scientists hypothesized that the Sun formed ________.

Summer occurs on the hemisphere of Earth that is

The yearly orbit of the Earth around the Sun is called its ______

The structure of a comet is considered to be like a large, _____, or a mass of frozen ice and rock.

_____ has colorful clouds in bands of white, red, tan,and brown.

The presence of maria on the Moon indicates that ______.

The Sun's rays strike Earth at their northernmost and southernmost positions during _______.

Solar energy trapped by gases in Venus' atmosphere causes ____.

Water is found as a solid, liquid, and gas on ______.

Galileo used his telescope to discover evidence for the Sun-centered model of the solar system. This evidence included all of the following EXCEPT

Evidence suggest that _____ originate in the Oort Cloud located beyond the orbit of Pluto

______ is the planet with the lowest density and a complex ring system

______ are pieces of rock that strike the surface of a moon or planet

A _____ occurs when the Moon moves directly between the Sun and Earth and throws a shadow on Earth.

The longest subdivision in geological time is a(n)

Today, some scientist think that ______.

With _____ dating, a rock's exact age can be determined, whereas with _____ dating, a rock's age is compared to the ages of other rocks.

All of the following conditions help preserve organisms as fossils EXCEPT _____.

A life form that evolved during the ______ Era was the dinosaur.

Pangaea separated into

The ____ is (are) an example of a transform boundary

The end of the Paleozoic Era was signaled by ________

A life-form in the Precambrian time was________

In a series of undisturbed rock layers where shale lies between sandstone on the bottom and limestone on the top, the _______.

Humans first appeared during the _____ Era

Animal life in the Cenozoic Era includes ________.

Animal life in the Paleozoic Era included all of the following EXCEPT

The youngest rocks on the ocean floor are located ______

Bands of rock on the seafloor showing alternating magnetic orientation indicate Earth's magnetic field has _______

Plates move apart at ______ boundaries

A lack of explanation for continental drift prevented many scientists from accepting that a single supercontinent called _______ once existed

Seafloor spreading occurs because ______