What two important factors determine the nature of an ecosystem?

a Temperature and humidity

C, Recycling of nutrients and flow of energy

b. Light and temperature

d. Flow of energy and predation

Why less dense, hot magma rises to the surface to displace denser cooler magma?

An astronaut on the moon places a package on a scale and finds its weight to be 10. N. () What would the weight of the package be on the earth? (b) What is the mass of the package on the moon? (c) What is the package's mass on earth?

During a car accident, a 125 kg driver is moving at 31 m/s and in 1.5 seconds is brought to rest by an inflating air bag. What is the magnitude of the change in momentum of the driver?

A scientific theory can change if what?

If a material contains 3 elements joined in a fixed proportion it is an

How are magnetic stripes near mid-ocean ridges evidence for sea-floor spreading?

If a truck has a mass of 2 x 106 grams and a velocity of 35m/s, what is its momentum? kgm/s a. 2 million b. 70 c. 57.14 d. 70,000 e. 57,100

A scientist heats a piece of iron until it is glowing white-hot. he places the metal inside a metal box. he removes all of the air from the inside of the box.

Johanna is studying what happens to the energy as a ball rolls down a ramp. What is she studying? Check all that apply. 1. gravitational potential energy 2. electrical energy 3. kinetic energy 4. mechanical energy 5. elastic potential energy

The density of sugar is 1.59 g/cm3. the mass of a sample is 4.0 g. find the volume of the sample