Term
| Gravity refers to a ________________ that attracts objects to each other. |
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Definition
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Term
| ___________ holds "us" to the Earth's surface. |
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Definition
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Term
True or False
Gravity is invisible. |
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Definition
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Term
| _____________ is related to the amount of matter in an _____________. |
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Definition
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Term
True or False
Your mass changes as you travel to other planets. |
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Definition
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Term
| The amount of surface gravity depends on the size and mass of the planet. The larger the diameter of a planet, the more _______________ it has. |
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Definition
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Term
| The force of gravity increases when one object has a much larger ______________ than the other objects. |
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Definition
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Term
| Weight is the measure of the force of _____________ on an object. |
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Definition
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Term
| Your weight ___________ in outer space and on other planets because their gravity is different than Earth's. |
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Definition
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Term
True or False
Your weight changes as you travel in space. |
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Definition
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Term
| In space without gravity pulling down on them, Astronauts are essentially __________________. Though they do not weigh anything, astronauts' body shape and size does not _______________. |
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Definition
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Term
| Newton determined that gravity affects apples falling from trees and holds _____________ and ___________ in their orbits. |
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Definition
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Term
| The Law of Inertia says that a ______________ in motion tends to travel in a straight line unless it is disturbed by an unbalanced force. |
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Definition
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Term
| The Sun's gravity holds all the _____________ in orbit around it, and each _____________ gravity captures and holds its _______________ in orbit. |
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Definition
| planets / planets' / moon(s) |
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Term
| _______________ with a lot of mass can probably hold more moons in their orbit. |
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Definition
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Term
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Definition
| metallic, rocky objects in space |
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Term
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Definition
| mass of frozen gas, comic dust and ice crystals |
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Term
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Definition
| pjeices of rock and metal dislodged from comets, planets, asteroids, or moons |
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Term
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Definition
| meteoroid entering a planet's atmoshpere creating a bright streak of light |
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Term
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Definition
| meteor that did not burn up completely and lands on the surface of a planet, moon, or asteroid |
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Term
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Definition
| the regular rise and fall of the sea |
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Term
| Gravitational attraction between ____________ and Earth cause the tides. |
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Definition
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Term
| There are _____ high tides and _______ low tides a day. |
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Definition
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Term
| The __________ gravity also affects the sea. |
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Definition
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Term
| Because the sun is farther (even though it is much bigger), it has ____________ of an effect on tides. |
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Definition
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Term
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Definition
| show the activities on animals |
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Term
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Definition
| forms when hard parts of an organism are buried in sediment, such as sand, silt, or clay |
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Term
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Definition
| the preseved remains of a once-living organism |
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Term
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Definition
| organisms turn into stone to preserve their remains |
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Term
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Definition
| preserved organisms in tar, ice or amber |
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Term
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Definition
| forms as the result of a mold |
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Term
| How does amber preserve fossils? |
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Definition
| an organism gets trapped in sap and hardens |
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Term
| How does tar preserve fossils? |
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Definition
| an organism gets stuck and dies in tar - tar soaks into the organism and hardens |
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Term
| How does ice preserve fossils? |
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Definition
| an organism freezes in its original state |
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Term
| What do fossils tell us and scientists? |
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Definition
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clues about organisms that lived long ago
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Earth's surface changes
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Evolution
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past environments
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Term
The first step for fossils:
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Definition
| An animal is buried by sediment, such as volcanic ash or silt, shortly after it dies. Its bones are protected from rotting by the layer of sediment. |
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Term
| The second step for fossils. |
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Definition
| More sediment layers accumulate above the animal's remains, and meineral, such as silica (a compound of silicon and oxygen), slowly replase the calcium phosphate in the bones. |
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Term
| The third step in fossils |
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Definition
| movement of tectonic plates, or giant rock slabs that make up Earth's surface, lifts up the sediments and pushes the fossil closer to the surface. |
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Term
| The fourth step in fossils |
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Definition
| Erosion from rain, river, and wind wears awy the remaining rock layers. Eventually, erosion or people digging for fossils will expose the presrved remains. |
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