A planet is an object that orbits around a ___.
star
When living things cause rocks to break apart, this is called ___ weathering.
biotic
What type of soil contains large air spaces between particles (labeled A).
sandy
Which type of rock is likely to contain fossils?
sedimentary
What is the age of the Earth?
4.5 billion years (4,500 million)
The outermost layer of the Earth that is made of solid rock (labeled A).
crust
The Earth's ___ is the line joining the North pole to the South pole.
axis
Patterns of stars in the night sky are called __.
constellations
When rock fragments rub against each other and the edges become smoother, this is called ___.
abrasion
How do we see stars?
They produce (emit) their own light & we see with our eyes
Which planet in our solar system has the shortest orbit around the Sun?
Mercury
Which type of soil has the worst drainage - loam, sandy, silt, or clay?
clay
Which planet is known for its giant rings?
Saturn
What type of rock is formed by the cooling of magma or lava?
igneous
The remains of living organisms that have changed into rock.
fossils
The movement of rock fragments by gravity, water, or wind is called ___.
erosion
What is the fourth planet from the Sun in our solar system?
Mars
Why do the position of stars appear to move throughout the year?
the Earth (moves) orbits around the Sun
When rock is worn away by rain, wind, frost, or temperature changes, this is called ___.
weathering
The layer of Earth that contains magma (labeled B).
mantle
What type of rock is formed by pressing down layers of sound?
sedimentary
The Sun rises in the ___ direction.
east
What type of rock is made from other rocks experiencing heat and pressure?
metamorphic
Material that comes from living things is called ___. (hint: starts with the letter H)
humus