8th Science Comprehensive Review

Question 1

What is an allele?

Accepted Answer

A pair of genes which combine to produce a trait

Question 2

What are pieces of evidence for the Big Bang theory?

Accepted Answer

All distant galaxies are moving away at high speed, Cosmic background radiation coming from all directions

Question 3

When you design an engineering solution, how do you know if your design is successful?

Accepted Answer

I write test criteria, then test to see if it meets them

Question 4

Why did Pangea break up?

Accepted Answer

Divergent plate boundaries

Question 5

What was the name of the super-continent which existed on Earth about 175 million years ago?

Accepted Answer

Pangea

Question 6

Why must we use data from the Moon's surface and asteroids to investigate Earth's age/history?

Accepted Answer

Age of an object is easier to tell when it has no atmosphere, Earth's surface changes rapidly due to tectonics, weathering

Question 7

How do the Water Cycle and Rock Cycle interact?

Accepted Answer

Water weathers, erodes, and deposits rock as it moves

Question 8

What are ways that climate can impact human activity?

Accepted Answer

Changing sea levels affect safety of coastal communities, Changing precipitation impacts growth of crops

Question 9

What is the first step in the Engineering Design Process?

Accepted Answer

Define the Problem

Question 10

What evidence do we have for the human causes of climate change?

Accepted Answer

Sharp increases in CO2 levels in recent glacial ice, Increase in global temperatures + increase in oil/coal use

Question 11

What are potential costs (downsides) of mining minerals/fossil fuels?

Accepted Answer

Water contamination in mined areas, Mined resources are nonrenewable, Mined materials may be toxic/destructive to Earth systems

Question 12

In oceanic subduction zones, what's the main contributor to the melting of magma?

Accepted Answer

Large amounts of water move into the mantle

Question 13

97% of Earth's water is...

Accepted Answer

Saline; contained in oceans

Question 14

True or false: Earth's climate & average temperatures have been constant throughout its history

Accepted Answer

False

Question 15

Approximately how much time will pass before the Sun expands to engulf the Earth?

Accepted Answer

5 billion years

Question 16

What is the single biggest contributor to weathering on Earth's surface?

Accepted Answer

Water

Question 17

Which change would cause rocks from Earth's mantle (solid) to melt into magma (liquid)?

Accepted Answer

Reduced pressure, increase in water content

Questions 17